Patent Publication Number: US-6335147-B1

Title: Developing processing method and apparatus

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a developing processing apparatus in which a silver halide color photographic light-sensitive material (hereinafter referred to as a photosensitive material) is subjected to developing processing, and a developing processing method in which the developing processing apparatus can be applied. 
     2. Description of the Related Art 
     An example of a developing processing method and apparatus is disclosed in, for example, U.S. Pat. Nos. 5,355,190 and 5,389,994 in which a processing solution is jetted from jetting holes of a blowoff chamber, which blowoff chamber is disposed on a conveying path of a photosensitive material, toward an emulsion surface of the photosensitive material, and the photosensitive material is subjected to developing processing while being conveyed horizontally, and further, a processing solution in a processing tank is agitated. 
     In this developing processing method and apparatus, a plurality of blowoff chambers are disposed in one processing tank and conveying rollers are located at both sides of each blowoff chamber. Accordingly, there is a limit to making the apparatus small in size. 
     Further, in order to obtain desired photographic properties, when a jetting region is extended by making the blowoff chamber larger, the apparatus increases in size. As a countermeasure against the foregoing, when an attempt to make the apparatus small in size is made by decreasing diameters of the conveying rollers which are disposed at both sides of the blowoff chamber, conveying torque decreases, which results in occurrence of jamming. 
     On the other hand, when the blowoff chambers and the conveying rollers are independently mounted in the processing tank, respective positions in a vertical direction of the apparatus or the direction in which the photosensitive material is conveyed are dislocated. Therefore, each time maintenance (for example, cleaning) of the processing tank is carried out, the photographic properties of the photosensitive material change. 
     SUMMARY OF THE INVENTION 
     In view of the above-mentioned circumstances, an object of the present invention is to obtain desired photographic properties and realize a small-size developing processing apparatus. 
     A first aspect of the present invention is a developing processing apparatus equipped with at least one blowoff chamber having jetting holes from which a processing solution is jetted toward an emulsion surface of a photosensitive material, wherein the one blowoff chamber is disposed in a processing tank, roller sets are located at both sides of the blowoff chamber, the photosensitive material is horizontally conveyed above the blowoff chamber, and positions where the photosensitive material is nipped by the roller sets are located within the processing solution. 
     The apparatus of the first aspect is a photosensitive material processing apparatus provided to process a photosensitive material and having a processing tank in which a processing solution is filled, and the photosensitive material processing apparatus comprises: at least one blowoff chamber disposed in the processing tank and having jetting holes from which the processing solution is jetted toward an emulsion surface of the photosensitive material; and roller sets located at both sides of the blowoff chamber and conveying the photosensitive material horizontally above the blowoff chamber, wherein positions where the photosensitive material is nipped by the roller sets are located within the processing solution filled in the processing tank. 
     According to the first aspect of the present invention, developing processing is carried out in such a manner that a processing solution is jetted out from the jetting holes of the blowoff chamber toward the emulsion surface of the photosensitive material. 
     Only the one blowoff chamber is disposed in the processing tank such as a developing tank or a bleach-fixing tank and the roller sets are disposed at both sides of the blowoff chamber. The photosensitive material is horizontally conveyed above the blowoff chamber by the roller sets. By reducing the number of components of the processing tank as described above, the apparatus can be made in small size. 
     Further, positions where the photosensitive material is nipped by the roller sets are located within the processing solution, and there is no possibility of the photosensitive material being nipped and conveyed by the roller sets in such a manner that outer peripheral surfaces of the rollers are wet non-uniformly with the processing solution. As a result, non-uniform processing is prevented. 
     A second aspect of the present invention is structured in such a manner that, in the above-described first aspect, the roller sets are mounted integrally in the processing rack set in the processing tank. Accordingly, there is no possibility of positions where the photosensitive material is nipped by an upstream-side roller set and a downstream-side roller set becoming dislocated and a distance between the roller sets changing thereby. 
     A third aspect of the present invention is structured in such a manner that, in the above-described first aspect, the blowoff chamber is, together with the roller sets, formed integrally with the processing rack. Accordingly, a positional relationship between the roller sets and the blowoff chamber, and an interval between the photosensitive material nipped and conveyed by the roller sets and a surface of the blowoff chamber  22  from which the processing solution is jetted can be maintained fixedly. 
     A fourth aspect of the present invention is structured in such a manner that, in the above-described first aspect, a diameter of each of the roller sets is in the range of 10 mm to 20 mm and a dimension of the blowoff chamber in a direction in which the photosensitive material is conveyed is in the range of 50 mm to 120 mm. It suffices that, in the present invention, a diameter of a lower roller of the roller set (which lower roller is disposed at the side of the blowoff chamber) is in the above-described range, and respective roller diameters of upper and lower rollers may be the same or different from each other. Further, it is necessary that a roller diameter of the upper roller be greater than or equal-to that of the lower roller. 
     By setting the diameters of the roller set as described above, necessary torque can be maintained. Accordingly, even a photosensitive material having a large widthwise dimension can be processed without causing jamming. Further, the dimension of the blowoff chamber in the direction in which the photosensitive material is conveyed is in the range of 50 mm to 120 mm, and therefore, a sufficient jet agitation effect can be achieved and desired photographic properties can be obtained. 
     A fifth aspect of the present invention is a developing processing method in which a processing solution is jetted toward an emulsion surface of a photosensitive material by a blowoff chamber having jetting holes formed therein, wherein the one blowoff chamber is disposed in a processing tank and the photosensitive material is processed while being horizontally conveyed above the blowoff chamber by roller sets, which are disposed at both sides of the blowoff chamber and are formed in such a manner that positions where the photosensitive material is nipped by the roller sets are located within the processing solution. 
     Sixth, seventh, eighth, and ninth aspects of the present invention are structured in a manner similar to the second to fifth aspects of the present invention in the above-described sixth aspect. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an exploded perspective view of a developing processing apparatus according to an embodiment of the present invention. 
     FIG. 2 is a cross-sectional side view of the developing processing apparatus according to the embodiment of the present invention. 
     FIGS. 3A and 3B are enlarged plan views which each show arrangement of jetting holes in the developing processing apparatus according to the embodiment of the present invention. 
     FIGS. 4A and 4B are graphs which each show a distance between a jetting hole and a paper (that is, a photosensitive material), and flow velocity. 
     FIG. 5 is a graph which shows a relationship between conveying torque and photographic property. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIGS. 1 and 2 each show a developing processing apparatus  10  according to an embodiment of the present invention. 
     The developing processing apparatus  10  is a system in which a photosensitive material is subjected to developing processing while being conveyed horizontally (in the present invention, the photosensitive material means a silver salt photographic light-sensitive material). A paper P serving as the photosensitive material is processed in a developing tank  12 , a bleach-fixing tank  14 , a plurality of washing tanks  16 , and a drying section  18  in that order while being horizontally conveyed, and is then discharged into a tray  20 . 
     Here, a blowoff chamber  22  which is a characterizing portion of the present invention is provided both in the developing tank  12  and in the bleach-fixing tank  14 . The blowoff chambers  22  provided in the two tanks have the same basic structures, and therefore, a description will be given, as an example, of the blowoff chamber disposed in the developing tank  12 . In the present invention, the blowoff chamber may be provided in one or both of the developing tank and the bleach-fixing tank. 
     A liquid-distributing block  24  is provided on a bottom surface of the developing tank  12 . A developing solution is sent to the liquid-distributing block  24  from a circulating pump  26  via a liquid-distributing pipe  28 . The liquid-distributing pipe  28  branches out into three connecting pipes  30  and the liquid-distributing block  24  is provided with discharging pipes  32  communicating with the connecting pipes  30  respectively. 
     On the other hand, recovery holes  34  are formed in a side wall of the developing tank  12  and used to regulate a liquid level of the developing solution. The developing solution is recovered into an auxiliary tank  36  via the recovery holes  34 . The developing solution recovered into the auxiliary tank  36  is, if necessary, replenished with a replenishing agent and water, and then delivered from a return pipe  27  via the circulating pump  26 , and thereafter blown off again from the discharging pipes  32  of the liquid-distributing block  24 . 
     The blowoff chamber  22  is set on the top surface of the liquid-distributing block  24 . Three water absorption openings  38  are formed in the bottom surface of the blowoff chamber  22  at the same intervals as those of the discharging pipes  32  and are provided to communicate with the discharging pipes  32 . The three water absorption openings  38  are linked via a rectangular storage portion  40  disposed at an upper side of the water absorption openings  38 . The developing solution discharged from the discharging pipes  32  reaches the storage portion  40  at a predetermined hydraulic pressure. 
     An open side of the storage portion  40  is closed by a jetting panel  42  in which a plurality of jetting holes  44  are formed so as to pass therethrough and the developing solution jetted from the jetting holes  44  is jetted upon an emulsion surface of the paper P. 
     On the other hand, a processing rack  46  is set on the top side of the developing tank  12 . The processing rack  46  is equipped with: an insertion roller pair  48  which guides an exposed paper P from an upper side to a lower side; a set of three conveying rollers  50 ,  52 , and  54 , which are located at the downstream side of the blowoff chamber  22  in a direction in which the paper P is conveyed and conveys the paper P to above the jetting holes  44  while correcting the position of the paper P conveyed obliquely by the insertion roller pair  48  into a horizontal position; and a set of conveying rollers  56  for conveying, to the bleach-fixing tank  14 , the paper P conveyed above the jetting holes  44  and subjected to developing processing. 
     Due to the rollers being mounted in the processing tank  46  as described above, there is no possibility of positions where the paper is nipped by an upstream-side roller pair and a downstream-side roller pair becoming dislocated and a distance between the roller pairs changing thereby. 
     Further, the position where the paper P is nipped by the conveying rollers  52  and  54  and the position where the paper P is nipped by the conveying roller pair  56  are located below a liquid level L of the developing solution. When the paper P is nipped by these rollers, the distance between the jetting holes  44  and the paper P is set to be 2.0 mm to 20.0 mm, and in the present embodiment, it is set to be 5.0 mm. 
     By setting the distance between the jetting holes  44  and the paper P as described above, non-uniform processing of the paper P is prevented in a region of the paper P facing the jetting holes  44  and its peripheries, to thereby improve photographic properties as can be seen by eye from the schematic diagram shown in FIG.  3 B. 
     The positions where the paper P is nipped by the three conveying rollers  50 ,  52 , and  54  are located below the liquid level L of the developing solution. The paper P is nipped by these rollers after having been immersed in the developing solution, and therefore, non-uniform processing is prevented. 
     Next, the blowoff chamber  22 , the jetting holes  44 , and the conveying rollers will be described in detail. 
     As shown in FIG. 3A, the hole diameter of each jetting hole  44  is preferably 0.5 mm to 0.9 mm, and in the present embodiment, it is set to be 0.7 mm. In this case, clogging does not easily occur and a processing solution can be jetted from the jetting holes stably for a long period of time. 
     Further, the jetting holes  44  are arranged at intervals of 3.0 mm to 4.5 mm in a longitudinal direction of the jetting panel  42  (that is, in a transverse direction of the photosensitive material). The jetting holes  44  are disposed in plural rows in such a manner that the rows of the jetting holes  44  form a staggered arrangement. In the present embodiment, these holes are arranged at intervals of 4.5 mm (from the centers of the holes) in the longitudinal direction of the jetting panel  42 . Adjacent three rows of the jetting holes  44  are located at different positions from each other to form the staggered arrangement, and the three rows are formed repeatedly on the jetting panel  42 . As a result, when seen from the direction in which the paper P is conveyed, the interval of the jetting holes  44  is substantially set to be 4.5 mm/3=1.5 mm. 
     When the intervals of the jetting holes  44  in the transverse direction of the paper P are substantially made narrower as described above, non-uniform processing does not occur and desired photographic properties can be obtained. 
     Further, the jetting holes  44  are arranged at intervals of 6.0 mm in the direction in which the paper P is conveyed and the total number of the jetting holes is 720, that is, 12 rows of jetting holes are provided in the direction in which the paper P is conveyed and  60  jetting holes are arranged per row in the transverse direction of the paper P. Here, a pump which pumps  20  liters per minute is used as the circulating pump  26 . A jet flow amount of the pump for each of the jetting holes  44  is 14.2 liters per minute and this value becomes 854.6 mm/s by calculation in terms of flow velocity. 
     FIGS. 4A and 4B show simulation results obtained by calculation of the distribution of jet flow velocity in the transverse direction of the paper P at a position which is 0.1 mm away from the emulsion surface. FIG. 4A shows an example in which the jetting holes  44  are arranged to form a repetition of a two-row zigzag pattern with adjacent jetting holes  44  being disposed at an interval of 10 mm, and FIG. 4B shows an example in which the jetting holes  44  are arranged to form a repetition of a three-row zigzag pattern with adjacent jetting holes  44  being disposed at an interval of 4.5 mm. In the present invention, the three-row zigzag pattern is more preferable than the two-row zigzag pattern. It can be seen from FIGS. 4A and 4B that, in the three-row zigzag pattern, non-uniform processing does not occur and desired photographic properties are obtained. 
     As described above, even when a conventional circulating pump  26  is used, the jet flow velocity can be increased depending on a setting pattern of the jetting holes  44 , and an ability to agitate the developing solution can be maintained. 
     On the other hand, the dimension B of the blowoff chamber  22  in the direction in which the paper is conveyed is in the range of 50 mm to 120 mm. Respective diameters of the conveying rollers  52  and  54 , which are disposed at the upstream side of the blowoff chamber  22  in the direction in which the paper is conveyed, and the diameter of the conveying roller  56  disposed at the downstream side of the blowoff chamber  22  are each in the range of 10 mm to 20 mm (preferably, 15 mm). 
     Further, developing processing time is in the range of 10 to 15 seconds and conveying speed is in the range of 7 to 20 mm/s. As compared with a conventional small-size developing processing apparatus, high-capacity processing becomes possible. 
     As shown in FIG. 5, when a paper having a large widthwise dimension (for example, a paper of A4-size(210×297 mm)) is used, a conveying torque of a conveying roller of at least 1 kg is required. By setting the diameter of the conveying roller to be 15 mm, a torque of 1.5 kg can be maintained and no jamming occurs. As a result, a desired photographic property (density) can be obtained. 
     Further, although in the present embodiment, the blowoff chamber  22  is provided in the developing tank  12 , it may also be mounted in the processing rack  46 . As a result, a positional relationship between a roller pair (or set) and the blowoff chamber  22  and an interval between the paper P nipped and conveyed by the roller pair and a surface of the blowoff chamber  22  from which the processing solution is jetted can be maintained fixedly. 
     [Composition of light-sensitive material] 
     A composition of a silver halide color photographic light-sensitive material which is preferably combined with the developing processing apparatus of the present invention will be described hereinafter in detail. 
     In the present invention, a silver halide emulsion layer containing a yellow coupler is preferably provided at a position further away from a substrate than at least one of a silver halide emulsion layer containing a magenta coupler and a silver halide emulsion layer containing a cyan coupler. Further, the silver halide emulsion layer containing a yellow coupler is more preferably provided at a position further away from the substrate than both of the other silver halide emulsion layers from the standpoint of color development, rapidity of desilvering, reduction of residual color caused by sensitizing dyes, and the like. In the present invention, it is preferable to use a silver halide color photographic light-sensitive material in which the silver halide emulsion layer containing a cyan coupler is coated on a substrate, the silver halide emulsion layer containing a magenta coupler is coated on the cyan coupler-containing layer, and the silver halide emulsion layer containing a yellow coupler is finally coated on the magenta coupler-containing layer. 
     A coating thickness of a photographic composition layer in the present invention is preferably in the range from 1.0 μm to 9.0 μm, more preferably in the range from 2.0 μm to 8.0 μm, and most preferably in the range from 3.5 μm to 7.0 μm. The coating thickness of a photographic composition layer in the silver halide color photographic light-sensitive material used in the present invention indicates a thickness of an unprocessed photographic composition layer located above the substrate. Concretely, the coating thickness of a photographic composition layer can be obtained by any one of the following methods: a method in which the coating thickness is obtained by cutting the silver halide color photographic light-sensitive material perpendicular to the substrate and observing a cut surface by an electron microscope; and a method in which the coating thickness is calculated from an amount of coating (g/m 2 ) of each of components in the photographic composition layer and a specific gravity thereof. The specific gravity of typical gelatin used for photographic processing is 1.34 g/ml and the specific gravity of silver chloride grains is 5.59 g/ml. The specific gravity of other oleophilic additives can also be measured. 
     The form of the silver halide grains contained in a photographic emulsion of a light-sensitive material preferably used in the developing processing apparatus of the present invention can be a form of a normal crystal such as cube, octahedron or tetradecahedron, or a form of irregular crystal habit such as spheroid or tablet, or a form of composite type. 
     A pair of parallel surfaces of a tabular grain, which are placed perpendicular to a direction along the thickness of the tabular particle, is called a principal plane. In the developing processing apparatus of the present invention, it is preferable to process a light-sensitive material including a photographic emulsion which contains a tabular grain having (111) plane as the principal plane or a tabular grain having (100) plane as the principal plane. Further, in the present invention, a light-sensitive material in which a photographic emulsion contains silver halide tabular grains having (100) plane is more preferably used. 
     Silver halide tabular grains having (111) plane and (100) plane, which are used for the light-sensitive material of the present invention, will be described in detail. 
     There have been disclosed processes in which various crystal habit controlling agents are used for the preparation of tabular grains. Among these crystal habit controlling agents, compounds described in Japanese Patent Application Laid-Open (JP-A) No. 2-32 (examples of compounds 1 to 42) are preferably used, and crystal habit controlling agents 1 to 29 described in JP-A No. 6-333780 are particularly preferable. However, the present invention is not limited to the same. 
     The tabular grains having (111) planes are obtained by forming two sets of parallel twinned crystal planes. The formation of the twinned crystal planes depends on a temperature, a dispersion medium (gelatin), halogen concentration, and the like. Therefore, it is necessary to set a proper value for each of these conditions. When the crystal habit controlling agent is allowed to be present at the time of nucleus formation, the concentration of gelatin is preferably in the range from 0.1 to 10%. The concentration of chloride is set to be 0.01 mol/L or more, preferably 0.03 mol/L or more. 
     It is preferably that no crystal habit controlling agent be used during nucleus formation in order that the grains be made monodisperse, which is disclosed in JP-A No. 8-184931. When no crystal habit controlling agent is used during nucleus formation, the concentration of gelatin is set in the range from 0.03 to 10%, preferably in the range from 0.05 to 1.0%. The concentration of chloride is set in the range from 0.001 to 1 mol/L, preferably in the range from 0.003 to 0.1 mol/L. The temperature of nucleus formation can be set arbitrarily in the range from 2 to 90° C., preferably in the range from 5 to 80° C., and most preferably in the range from 5 to 40° C. 
     At the initial stage of nucleus formation, nuclei of tabular grains are formed, and immediately after the formation of nuclei, a large number of nuclei other than those of tabular grains are placed in a reaction vessel. Accordingly, it becomes necessary to use a technique in which ripening is conducted after the nucleus formation, and only nuclei of the tabular grains are allowed to remain and the others-are removed. When ordinary Ostwald ripening is carried out, the nuclei of tabular grains are also molten and disappear. Therefore, the nuclei of tabular grains decreases, and the size of the resulting tabular grains thereby increases. In order to solve this problem, a crystal habit controlling agent is added. Particularly with gelatin phthalate being used together, the effect of the crystal habit controlling agent is enhanced to prevent melting of the tabular grains. During the ripening, pAg is particularly important and is preferably in the range from 60 to 130 mV for a silver-silver chloride electrode. 
     The formed nuclei are allowed to grow in the presence of the crystal habit controlling agent by physical ripening and through the addition of a silver salt and a halide. In this case, the chloride concentration is 5 mol/L or less, and preferably 0.05 to 1 mol/L. The temperature at the time of growth of the nuclei may be selected in the range from 10 and 90° C., but the temperature is preferably in the range from 30 to 80° C. 
     The total amount of the crystal habit controlling agents used is preferably 6×10 −5  mol or more, and most preferably in the range from 3×10 −4  to 6×10 −2  mol per mol of silver halide in a completed emulsion. The timing of addition of the crystal habit controlling agent may be at any stage between the stage of nucleus formation and the stage of the physical ripening of the silver halide grains. After the addition of the crystal habit controlling agent, growth of (111) plane begins. The crystal habit controlling agent may be placed in a reaction vessel in advance. When small-size tabular grains are formed, the crystal habit controlling agent may be added to the reaction vessel such that its concentration will increase as the grains grow. 
     When the amount of a dispersion medium used at the time of nucleus formation is not sufficient for the growth of the grains, it is necessary to add the dispersion medium. It is preferable that gelatin be present in the range from 10 g/L to 100 g/L in the growth thereof. An example of gelatin to be added is preferably gelatin phthalate or trimellitic acid-added gelatin. 
     The value of pH at the time of nucleus formation may be arbitrarily set, and preferably set in the range from a neutral region to an acid region. 
     Next, a description will be given of tabular grains having (100) planes. The tabular grains having (100) planes are those having (100) plane as a principal plane. The form of the principal plane is a form of a rectangle, a form of a triangle, tetragon, or pentagon with any one angle of the rectangle being omitted (that is, a right-angled triangle having the omitted angle as an apex and formed by two sides which form the angle), or a form of a tetragon, pentagon, hexagon, heptagon, or octagon with two to four angles being omitted. Assuming that the form of a rectangle with the omitted portion being complemented is a complementary tetragon, the ratio of adjacent sides of the rectangle and the complementary tetragon (the ratio between the length of a longer side and that of a shorter side) is in the range from 1 to 6, preferably in the range from 1 to 4, and more preferably in the range from 1 to 2. 
     The tabular grains of a silver halide emulsion, having (100) principal planes are prepared in such a manner that a silver-salt aqueous solution and a halide-salt aqueous solution are added to and mixed with a dispersion medium such as a gelatin aqueous solution while being stirred. In this case, for example, in JP-A Nos. 6-301129, 6-347929, 9-34045, and 9-96881, there has been disclosed a method in which silver iodide or iodide ion, or silver bromide or bromide ion is allowed to be present to thereby cause distortion in nuclei from difference in crystal lattice size between silver chloride and, for example, silver bromide, and crystal deficiency which imparts anisotropic growth such as screw dislocation is introduced. When the screw dislocation is introduced, two-dimensional nucleus formation on the plane is not any longer rate-controlled under a low supersaturation condition. Therefore, crystallization on the plane advances, and by introducing the screw dislocation, the tabular grains are formed. The low supersaturation condition mentioned herein shows, preferably 35% or less of an amount at the time of critical addition, more preferably 2 to 20%. It is not necessarily determined that the crystal deficiency cause screw dislocation, but it is considered that the screw dislocation be introduced at a high possibility due to a direction in which the dislocation is introduced, or imparting of anisotropic growth to the grains. It is preferable that the introduced dislocation be held so that the tabular grains be made thinner, which is disclosed in JP-A Nos. 8-122954 and 9-189977. 
     Further, a method for preparing (100) tabular grains with a (100) plane-forming accelerator added thereto is disclosed by using imidazoles, 3,5-diaminotriazoles (in JP-A No. 6-347928) or by using polyvinyl alcohols (in JP-A No. 8-339044). However, the present invention is not limited to the same. 
     Grains having a high content of silver chloride used in the present invention is grains whose silver chloride content is 80 mole % or more, preferably 95 mole % or more. The grains of the present invention preferably have a so-called core/shell structure comprised of a core section and a shell section surrounding the core section. The core section preferably contains 90 mole % or more of silver chloride. The core section may be comprised of two or more portions having different halogen compositions. The shell section preferably covers 50% or less of the total volume of the grains, most preferably 20% or less. The shell section preferably contains silver iodochloride or silver iodobromochloride. Further, the shell section preferably contains 0.5 to 13 mole % of iodine, most preferably 1 to 13 mole %. A silver iodide content of the total grains is preferably 5 mole % or less, most preferably 1 mole % or less. 
     The silver bromide content in the shell section is preferably higher than that in the core section. The silver bromide content is preferably 20 mole % or less, most preferably 5 mole % or less. 
     The silver halide grains used for the light-sensitive material of the present invention are not particularly limited in an average grain size (equivalent-sphere diameter in terms of volume), but the average grain size is preferably in the range from 0.1 to 0.8 μm, most preferably in the range from 0.1 to 0.6 μm. The equivalent-circle diameter of the tabular grains is preferably in the range from 0.2 to 1.0 μm. The equivalent-circle diameter of the silver halide grains mentioned herein is a diameter of a circle whose area is equal to a projected area of the grain in an electron micrograph. Further, the thickness of the grain is 0.2 μm or less, preferably 0.15 μm or less, and particularly preferably 0.12 μm or less. In the present invention, 50% or more of the projected area of all the silver halide grains containing yellow dye-forming couplers has an average aspect ratio (that is, the ratio of the diameter to the thickness of the grains) of 2 or more, preferably 5 to 20. 
     Generally, the tabular grains are those having two parallel planes. Accordingly, the “thickness” mentioned in the present invention is represented by a distance between the two parallel planes which form the tabular grain. 
     The grain size distribution of the silver halide grains used in the present invention may be polydisperse or monodisperse, but it is more preferably monodisperse. Particularly, the coefficient of variation in an equivalent-circle diameter of tabular grains which cover 50% or more of the total projected area is preferably 20% or less, and desirably 0%. 
     EXAMPLES 
     The present invention will be hereinafter described in accordance with the following examples, but the embodiment of the present invention is not limited to the same. 
     In the description of examples given below, a blue sensitive emulsion layer, a green sensitive emulsion layer, and a red sensitive emulsion layer are referred to as a yellow-coupler containing layer, a magenta-coupler containing layer, and a cyan-coupler containing layer, respectively, according to circumstances. Further, after developing processing, these emulsion layers are referred to as a yellow coloring layer, a magenta coloring layer, and a cyan coloring layer, respectively. Still further, these emulsion layers may be represented simply as BL, GL, and RL, respectively. 
     Example 1 
     (1) Preparation of samples of light-sensitive materials 
     A sample  111  of example 1 disclosed in JP-A No. 11-24217 was prepared and formed into a roll having a transverse dimension of 254 mm, to thereby prepare a sample  101 . 
     Next, samples  102  and  103  were prepared from the sample  101  by making a change in components of a light-sensitive material shown below. 
     1. Alteration of blue sensitive silver halide emulsion 
     Sample  102 : 
     A sample  102  of light-sensitive material was prepared by using the same emulsions as those of the sample  101 , except that a silver chlorobromide emulsion A which is a yellow-coupler containing layer in the sample  101  was changed to the following emulsion A-II. 
     Sample  103 : 
     A sample  103  of light-sensitive material was prepared by using the same emulsions as those of the sample  101 , except that a silver chlorobromide emulsion A which is a yellow-coupler containing layer in the sample  101  was changed to the following emulsion A-III. 
     &lt;Preparation of emulsions&gt; 
     Preparation of emulsion A-II [(111) tabular grains having a high content of silver chloride (average grain size: 0.46 μm)] 
     2.0 g of sodium chloride and 2.8 g of inert gelatin were added to 1.2 L of water in a vessel and was kept at 33° C. To this solution, 45 cc of a silver nitrate aqueous solution (18 g of silver nitrate) and 45 cc of a sodium chloride aqueous solution (6.4 g of sodium chloride) were added, while being stirred, in double jets for 1 minute. 1 minute after completion of the addition, 0.8 millimole of the following crystal habit controlling agent 1 and 560 g of a gelatin phthalate aqueous solution (10%) were added. Then, 1 minute later, 3.0 g of sodium chloride was added to the mixture. The temperature of a reaction vessel was heated up to 60° C. over 25 minutes, and the mixture was ripened at 60° C. for 16 minutes. Thereafter, 3 g of sodium chloride and 1×10 −5  mole of sodium thiosulphonate were added to the above mixture. To the mixture, 295 cc of a silver nitrate aqueous solution (18 g of silver nitrate), 295 cc of a sodium chloride aqueous solution (containing 50.3 g of sodium chloride and 2×10 −8  mole of iridium hexachloride), and 160 cc of an aqueous solution of the crystal habit controlling agent 1 (M/50) were added over 13 minutes at an increased flow rate. 2 minutes later, a silver nitrate aqueous solution (34 g of silver nitrate) and a sodium chloride aqueous solution (containing 11.6 g of sodium chloride and 1.27 mg of yellow prussiate of potash) were further added over 5 minutes. Then, 33.5 cc of a 0.1N thiocyanic acid solution, 0.32 millimole of a sensitizing dye J, 0.48 millimole of a sensitizing dye K, and 0.05 millimole of a sensitizing dye L were added to the mixture. 
     The mixture was cooled down to 40° C. and demineralized by an ordinary flocculation method. After water washing, 67 g of gelatin, 80 cc of phenol (5%), and 150 cc of distilled water were added, and pH was controlled to 6.2 and pAg was controlled to 7.5 with caustic soda and a silver nitrate solution. 
     The ratio of tabular grains to total grains was 90% or more of the total projected area of all the obtained grains, and the average equivalent-circle diameter was 0.71 μm, the average thickness was 0.13, and the average equivalent-sphere diameter was 0.46 μm. 
     Crystal habit controlling agent 1                    
     (2) Preparation of Emulsion A-III [(100) tabular grains having a high content of silver chloride (average grain size: 0.47 μm)] 
     1.2 L of water, 25 g of gelatin (deionized alkaline-treatment bone gelatin whose methionine content is about 40 μmol/g), 0.4 g of sodium chloride, and 4.5 ml of a solution of nitrate (IN) were placed in a reaction vessel (pH: 4.5) and kept at 40° C. To the mixture, an Ag-1 solution (silver nitrate is contained at the rate of 0.2 g/cc) and an X-1 solution (sodium chloride is contained at the rate of 0.069 g/cc) were added and mixed for 4 minutes at the rate of 48 cc/min. while being strongly stirred. 15 seconds later, 150 ml of a polyvinyl alcohol aqueous solution (containing 6.7 g of polyvinyl alcohol (PVA-1) in which an average degree of polymerization of vinyl acetate is 1700 and an average saponification rate for alcohol is 98% or more, and also containing 1 L of H 2 O) was further added. 
     To the obtained mixture, 12.3 ml of a solution of nitrate (1N) was added and pH was controlled to 3.5. The mixture was heated up to 75° C. over 15 minutes, and 23 ml of a solution of sodium hydroxide (1N) was added and pH was controlled to 6.5. To the mixture, 4.0 ml of 1-(5-methylureidophenyl)-5-mercaptotetrazole (0.05%) and 4.0 ml of N,N′-dimethylimidazoligene-2-thion (1% aqueous solution) were added. 4 g of sodium chloride was added and a silver potential (against a room-temperature saturated calomel electrode) was adjusted to 100 mV. Thereafter, an Ag-1 solution and an X-1 solution were added simultaneously for 15 minutes, so as to allow growth of grains, while the flow rate being increased linearly from 40 cc/min. to 42 cc/min. with the silver potential being kept at 100 mV. To the obtained mixture, 12.5 ml of a solution of nitrate (1N) was added and pH was controlled to 4.0. 28.8 g of sodium chloride was added and the silver potential was controlled to 60 mV, and thereafter, 0.38 millimole of a sensitizing dye J, 0.56 millimole of a sensitizing dye K, and 0.06 millimole of a sensitizing dye L were added and an Ag-2 solution (silver nitrate: 0.1 g/cc) and an X-2 solution (sodium chloride: 0.0345 g/cc) were added for 10 minutes at the flow rate of 40 cc/min., and thereafter, the mixture was allowed to stand for 10 minutes at 75° C. 
     Thereafter, the resulting mixture was washed by precipitation at 40° C., and was thereby demineralized. 79 g of gelatin was added to disperse again the emulsion, and pH was controlled to 6.0 and pAg was controlled to 7.3. Then, a portion of the emulsion was sampled and an electron photomicrographic image (TEM image) of a replica of the grains was observed. As a result, the ratio of tabular grains having (100) plane as a principal plane to total grains was 90% of the total projected area of all the AgX grains, and the average equivalent-sphere diameter was 0.47 μm, the average grain thickness was 0.10 μm, and the average aspect ratio was 7.8, and the average adjacent edge ratio was 1.2. 
     Sensitizing dye J                    
     Sensitizing dye K                    
     Sensitizing dye L                    
     2. Alteration of coating sequence of coloring layers and alteration of amount of gelatin 
     Sample  102 : 
     In the sample  102 , coloring layers were formed in the order of yellow, magenta, and cyan from the side of a substrate by changing the order in which the coloring layers are formed in the sample  101 . Further, the sample  102  was prepared in the same way as in the sample  101 , except that a total amount of gelatin is changed from 7.12 to 5.69 g/m 2  by reducing an amount of a gelatin binder of each of other layers than the yellow-coupler containing layer in the sample  101  by 25%. 
     Sample  103 : 
     The sample  103  was prepared in the same way as in the sample  101 , except that a total amount of gelatin is changed from 7.12 to 5.69 g/m 2  by reducing an amount of a gelatin binder of each of other layers than the yellow-coupler containing layer in the sample  101  by 25%. 
     (2) Developing processing and evaluations 
     1. Exposure and processing conditions for color paper 
     A human figure was photographed at the center of a background of outdoors and fine weather on a commercial color negative film (Fuji Color Negative Film Super 400 manufactured by Fuji Photo Film Co., Ltd.), and the color film was subjected to developing processing using an automatic processor FP-363SC manufactured by Fuji Photo Film Co., Ltd., and a color negative film processing formula CN-16S and its processing chemicals (which are both manufactured by Fuji Photo Film Co., Ltd.). 
     Image information was read from the developed color negative film by an input device/scanner-image processor SP1500 (manufactured by Fuji Photo Film Co., Ltd.), and the sample  102  was exposed by a laser exposure unit using the processing apparatus of the present embodiment shown in FIG. 2, and running processing was carried out by processes and processing solutions, which will be described later, until an accumulated amount of replenishment of a developing solution becomes three times the capacity of the tank. 
     A mini-lab printer processor PP728 manufactured by Fuji Photo Film Co., Ltd. was used as a comparative processor in carrying out the running processing. The processor PP728 was modified so that a processing time can be arbitrarily changed. The sample  102  was exposed by a plane exposure unit installed in the processor PP728 using the above-described developed color negative film, and the running processing was carried out in the same processes and processing solutions as those of the present embodiment. 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                   
                   
                   
                   
                 Tank 
               
               
                 Process 
                 Temperature 
                 Time 
                 Replenisher* 
                 capacity 
               
               
                   
               
             
            
               
                 Color 
                 45° C. 
                 15 seconds 
                  35 ml 
                 1.5 L 
               
               
                 development 
               
               
                 Bleach-fix 
                 40° C. 
                 15 seconds 
                  35 ml 
                 1.5 L 
               
               
                 Rinsing 1 
                 40° C. 
                  4 seconds 
                 — 
                 0.5 L 
               
               
                 Rinsing 2 
                 40° C. 
                  4 seconds 
                 — 
                 0.5 L 
               
               
                 Rinsing 3 
                 40° C. 
                  4 seconds 
                 — 
                 0.5 L 
               
               
                 Ringing 4 
                 40° C. 
                  8 seconds 
                 180 ml 
                 1.0 L 
               
               
                 Drying 
                 85° C. 
                 10 seconds 
               
               
                   
               
               
                 *An amount of replenisher is indicated by an amount per square meter of light-sensitive material.  
               
            
           
         
       
     
     The rinsing process is effected by using four tanks and these tanks are formed as a countercurrent flow system from the fourth to the first one. 
     The compositions of the processing solutions are described below. 
     
       
         
           
               
               
               
             
               
                   
               
               
                   
                   
                 (to be 
               
               
                 Color developing solution: 
                 (in a tank) 
                 replenished) 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 water 
                 800 
                 ml 
                 800 
                 ml 
               
               
                 triisopropanolamine 
                 0.2 
                 mol 
                 0.2 
                 mol 
               
               
                 ethylenediamine tetraacetate 
                 4.0 
                 g 
                 4.0 
                 g 
               
               
                 4,5-dihydroxybenzene-1,3-disodium 
                 0.5 
                 g 
                 0.5 
                 g 
               
               
                 disulphonate 
               
               
                 potassium chloride 
                 15.8 
                 g 
                 — 
                   
               
               
                 potassium bromide 
                 0.045 
                 g 
                 — 
                   
               
               
                 sodium sulfite 
                 0.1 
                 g 
                 0.1 
                 g 
               
               
                 fluorescent whitening agent Hakkol FWA-SF 
                 4.0 
                 g 
                 8.0 
                 g 
               
               
                 (manufactured by Showa Chemical Industry 
               
               
                 Co., Ltd.) 
               
               
                 sodium p-toluenesulfonate 
                 20.0 
                 g 
                 20.0 
                 g 
               
               
                 disodium-N,N-bis(sulfonatoethyl) 
                 20.0 
                 g 
                 20.0 
                 g 
               
               
                 hydroxylamine 
               
               
                 N-ethyl-N-(β-methanesulfonamidethyl)-3- 
                 6.0 
                 g 
                 24.0 
                 g 
               
               
                 methyl-4-aminoaniline · 3/2 sulfate 
               
               
                 monohydrate 
               
               
                 potassium carbonate 
                 26.3 
                 g 
                 26.3 
                 g 
               
               
                 addition of water 
                 1000 
                 ml 
                 1000 
                 ml 
               
               
                 pH (25° C./adjusted by potassium hydroxide) 
                 10.35 
                   
                 12.60 
                   
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
             
               
                   
               
               
                   
                   
                 (to be 
               
               
                 Bleach-fixing solution: 
                 (in a tank) 
                 replenished) 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 water 
                 500 
                 ml 
                 500 
                 ml 
               
               
                 ammonium thiosulfate (75%) 
                 104 
                 ml 
                 193 
                 ml 
               
               
                 ethylenediamine tetraacetatic acid 
                 3.2 
                 g 
                 5.9 
                 g 
               
               
                 ethylenediamine tetraacetatic acid, iron (III) 
                 62.0 
                 g 
                 124.0 
                 g 
               
               
                 ammonium salt dihydrate 
               
               
                 ammonium sulfite monohydrate 
                 58.0 
                 g 
                 116.0 
                 g 
               
               
                 ammonium bromide 
                 10.0 
                 g 
                 20.0 
                 g 
               
               
                 n-butylguanidine half sulfate 
                 6.6 
                 g 
                 14.8 
                 g 
               
               
                 succinic acid (50%) 
                 24.0 
                 g 
                 44.0 
                 g 
               
               
                 addition of water 
                 1000 
                 ml 
                 1000 
                 ml 
               
               
                 pH (25° C.: adjusted by nitric acid) 
                 5.50 
                   
                 4.98 
                   
               
               
                   
               
            
           
         
       
     
     Rinsing solution (a solution contained in the tank and a solution to be replenished have the same composition) 
     
       
         
           
               
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 chlorinated sodium isocyanurate 
                 0.2 
                 g 
               
               
                   
                 deionized water (conductivity: 5 μs/cm or less) 
                 1000 
                 ml 
               
               
                   
                 pH 
                 6.5 
                   
               
               
                   
                   
               
            
           
         
       
     
     2. Evaluation of photographic properties 
     After completion of the running processing, developing processing was carried out after a continuous tone wedge exposure was applied to the sample  101  using a sensitometer (manufactured by Fuji Photo Film Co., Ltd., FW type, color temperature of a light source is 3200K, exposure time is 0.1 second, and an amount of exposure is 250 CMS). Further, as shown in FIG. 5, the developing processing was carried out by changing the roller diameter to 12.5 φ, 15φ, and 20φ. The density of the developed sample was measured and the maximum density portion (Dmax) measured by blue light (filter light corresponding to status A) was read from the characteristic curve. The results are shown in FIG.  5 . In this figure, a desired photographic property (density) is a value obtained by the mini-lab printer processor PP728 manufactured by Fuji Photo Film Co., Ltd., which is used as the comparative processor. 
     It can be seen from FIG. 5 that no-jamming conveying property is maintained (a conveying torque of approximately 1 kg or more is required) and the desired photographic property can be obtained by the present embodiment. The desired photographic property mentioned herein means an agitation effect of the processor. The sample  101  in the above-described processing conditions is in a state of being subjected to developing processing, and the density B of the lowermost layer is influenced by the agitation. Accordingly, it can be seen from FIG. 5 that the agitation ability of the present embodiment is higher than the ability of the comparative processor and the present embodiment is excellent in rapidity of the processing. 
     Example 2 
     After completion of the running processing of Example 1, photographic property and conveying property were evaluated in the following procedure. 
     1. Evaluation of photographic properties 
     After completion of the running processing, developing processing was carried out under experimental conditions shown in Table 1 with the samples  102  and  103  being exposed in the same manner as in Example 1. 
     The densities of the developed samples were measured and the maximum density portion (Dmax) measured by blue light (filter light corresponding to status A) was read from the characteristic curve. 
     The photographic property was evaluated by calculating the following expression on the basis of respective values of the samples in the mini-lab printer processor PP728 manufactured by Fuji Photo Film Co., Ltd., which was used as the comparative processor. 
     If the value of ADmax(B) is positive, the ability of agitation higher than that of the comparative processor is realized, which is shown as a preferred embodiment. 
     
       
         ΔDmax(B)=[Dmax(B) in each experimental condition]−[Dmax(B) in PP728] 
       
     
     2. Evaluation of conveying property 
     After completion of the running processing, a gray wall was photographed at a standard amount of exposure in the state of being illuminated by a light source of standard C mentioned in ISO5800 (sensitometry of color negative film) on a Fuji Color Negative Film Super 400 (manufactured by Fuji Photo Film Co., LTD.), and the samples  102  and  103  which are cut in quarters (which are each 254 mm×305 mm) were exposed in the same manner as in Example 1 and continuous processing was carried out every 50 sheets under the conditions shown in Table 1. 
     The conveying property was evaluated for the obtained color prints on the basis of the following criteria: 
     ◯: no damage such as separation of coating was found at ends of the prints; 
     Δ: damage was found at ends of 1 to 20 sheets of prints among 50 sheets, but no problem is offered in practical use; 
     X: damage was found at ends of 21 to 50 sheets of prints among 50 sheets, and a problem is offered in practical use; and 
     XX: damage was found at ends of all the 50 sheets of prints, and jamming was also caused. 
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                   
                   
                   
                 Photogr- 
                   
                   
               
               
                   
                   
                   
                 aphic 
                   
                   
               
               
                 Experimental 
                   
                 Roller 
                 property 
                 Conveying 
                   
               
               
                 condition 
                 Sample 
                 diameter 
                 ΔDmax(B) 
                 property 
                 Note 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 1 
                 102 
                 8 
                 mm 
                 +0.03 
                 X 
                 Comp. ex. 
               
               
                 2 
                 102 
                 12.5 
                 mm 
                 +0.03 
                 ∘ 
                 Present 
               
               
                   
                   
                   
                   
                   
                   
                 invention 
               
               
                 3 
                 102 
                 15 
                 mm 
                 +0.03 
                 ∘ 
                 Present 
               
               
                   
                   
                   
                   
                   
                   
                 invention 
               
               
                 4 
                 102 
                 20 
                 mm 
                 +0.02 
                 ∘ 
                 Present 
               
               
                   
                   
                   
                   
                   
                   
                 invention 
               
               
                 5 
                 102 
                 25 
                 mm 
                 −0.06 
                 ∘ 
                 Comp. ex. 
               
               
                 1 
                 103 
                 8 
                 mm 
                 +0.04 
                 X 
                 Comp. ex. 
               
               
                 2 
                 103 
                 12.5 
                 mm 
                 +0.03 
                 Δ 
                 Present 
               
               
                   
                   
                   
                   
                   
                   
                 invention 
               
               
                 3 
                 103 
                 15 
                 mm 
                 +0.02 
                 ∘ 
                 Present 
               
               
                   
                   
                   
                   
                   
                   
                 invention 
               
               
                 4 
                 103 
                 20 
                 mm 
                 +0.01 
                 ∘ 
                 Present 
               
               
                   
                   
                   
                   
                   
                   
                 invention 
               
               
                 5 
                 103 
                 25 
                 mm 
                 −0.07 
                 ∘ 
                 Comp. ex. 
               
               
                   
               
               
                 Note: “Comp. ex.” means comparative example.  
               
            
           
         
       
     
     It can be seen from Table 1 that the photographic property (desired agitation ability) and the conveying property are compatible with each other by the present embodiment. Further, it can also be understood that combination of the processing apparatus according to the present invention and the sample  102  allows compatibility between the photographic property and the conveying property in a more stabilized region. 
     The present invention thus provides the above-mentioned structure and method, and therefore, the desired photographic properties can be obtained and the apparatus can be made small in size.