JPS6240447A - Direct positive image forming method - Google Patents

Abstract

PURPOSE:To obtain a fine positive image having high maximum density and low minimum density by changing continuously or stepwise the illuminance of light irradiated for whole image exposure and regulating the ratio between the extents of the photographic effects of the whole image exposure on silver halide emulsion layers to <=20. CONSTITUTION:When a silver halide photographig sensitive material having two or more internal latent image type silver halide emulsion layers having different photosensitive wavelength ranges on the support is subjected to whole image exposure, the illuminance of light irradiated for the whole image exposure is changed continuosly or stepwise and the ratio between the extents of the photographic effects of the whole image exposure on the silver halide emulsion layers is regulated to <=20. Thus, a fine positive image is obtd. by an optical fogging method with an internal latent image type direct positive photosensitive material.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a direct positive image forming method, and more specifically,
The present invention relates to a method of directly obtaining a positive color image by imagewise exposing an internal latent image type silver halide photographic light-sensitive material and then carrying out a surface development treatment involving full-surface exposure.

BACKGROUND OF THE INVENTION It is generally well known that silver halide photographic materials can be used to directly form positive photographic images without the need for intermediate processing steps or negative photographic images.

The methods can be mainly divided into two types in consideration of their practical usefulness.

One type uses a silver halide emulsion that has been coupled in advance and uses the reversal phenomenon of the solarized region or the Burschel effect to destroy fog nuclei (latent images) in exposed areas, thereby obtaining a positive image after development. It is something.

The other type uses an internal latent image type silver halide photographic emulsion that has not been coupled in advance, and after image exposure, after fogging treatment and/or while performing fogging treatment, surface development is performed to obtain a positive image. It is something.

・The above-mentioned internal latent image type silver halide photographic emulsion is
A silver halide photographic emulsion that has photosensitive nuclei mainly inside the silver halide grains, and a latent image is preferentially formed inside the grains when exposed to light.

This latter type of method is generally more sensitive than the former type of method and is suitable for applications requiring high sensitivity, and the present invention relates to this latter type of method.

Various techniques are known in this technical field. For example, U.S. Patent No. 2.592.250,
2,466.957, 2,497,875, 2,588,982, 3.761, 26
No. 6, No. 3,761.276, No. 3,796,5
The main ones are those described in the specifications of No. 77 and British Patent Nos. 1.151 and 363.

By using these known methods, direct positive type photographic materials with relatively high sensitivity can be produced.

Furthermore, although it cannot be said that a clear explanation has been given regarding the details of the direct positive image formation mechanism, for example, the theory of
The Photographic Process J (7he
Theory of theP photography
The process by which a positive image is formed can be understood to some extent by the ``desensitizing effect of an internal latent image'' as discussed on page 161 of the 3rd edition.

In other words, fog nuclei are selectively generated only on the surface of unexposed silver halide grains due to the surface desensitization effect caused by the so-called internal latent image created inside the silver halide grains by the first image exposure, and then normally It is thought that a photographic image is formed in the unexposed area by developing the fog nuclei on the surface by surface development.

The above-mentioned methods for selectively forming fog nuclei include two methods: one is a method called optical fogging, in which the entire surface of the photosensitive layer is exposed to light, and the other is chemical fogging, which is a method using agents such as fogging agents. A coupler method is known.

Among the above methods, the chemical fog method uses high DH with a pH of 12 or more.
Since there are severe conditions in which the effect of the fogging agent can only be obtained when the fogging agent is used, the fogging agent tends to deteriorate due to air oxidation, resulting in a disadvantage that the fogging effect is significantly reduced.

On the other hand, in the case of the optical fog method, it is convenient in practice because it does not require the harsh conditions mentioned above, but it requires some technical improvements in order to serve various purposes in a wide range of photographic fields. Problems remain. In other words, since the photofogging method is based on the formation of fog nuclei through photodecomposition of silver halide, the appropriate exposure intensity and duration will vary depending on the type and characteristics of the silver halide used. .

In the optical fog method, for example, Japanese Patent Publication No. 45-12709
The publication describes a method of uniformly exposing the entire surface to light of low intensity. According to this document, it is possible to obtain a good direct positive image having a high maximum density and a low minimum density by applying low-intensity exposure to the entire surface.

It is practically very useful to apply an internal latent image type direct positive emulsion to silver halide color photographic light-sensitive materials. In general, as a method for forming a positive color image, a color reversal image is obtained by imagewise exposing a silver halide color photographic light-sensitive material, followed by black and white development with a black and white developing solution, and then whole surface exposure or whole surface fogging with a fogging agent and color development. However, the above-mentioned color reversal processing has the disadvantage that the number of processing steps is large and the processing is very complicated. However, a positive color photosensitive material using an internal latent image type direct positive emulsion has a favorable feature of being easy to process because a positive image can be obtained by one development.

The inventors of the present invention applied an internal latent image type direct positive emulsion to a color photosensitive material and investigated the possibility of obtaining an image using the photofogging method. Under the condition that the entire surface is uniformly exposed to low-intensity light, it was not possible to obtain satisfactory image characteristics in all of the formed images of a plurality of layers. In addition, JP-A-56-137350 describes that light fog exposure is carried out using a fluorescent lamp with high color rendering properties, but certain internal latent image type direct positive color photosensitive materials have good characteristics. However, it has been found that other internal latent image type direct positive color photosensitive materials have the disadvantage that only unsatisfactory positive color images can be obtained.

In other words, when developing an internal latent image type direct positive color photosensitive material using the photofogging method, it is necessary to expose the material to relatively low intensity light in a limited range in order to obtain a good positive color image. , illuminance lower than this standard does not provide sufficient maximum density, and higher intensity not only reduces the maximum m degree but also significantly increases the minimum density, which reduces the quality of the positive image in the highlight area. was found to be severely damaged. Furthermore, the intensity of exposure within a certain limited range in which a good positive image can be obtained may be different for silver halide emulsion layers in which the plurality of sensitive wavelength regions of the positive color light-sensitive material are not the same, and in such a case, It is not possible to obtain a good positive image. In consideration of this point, the specification of JP-A-56-137350 uses a fluorescent lamp with high color rendering properties as a light source, but the internal latent image type direct positive color photosensitive material used has characteristics against light fog exposure. It has been found that it is difficult to obtain good positive color images when the color changes.

On the other hand, Japanese Patent Publication No. 58-6936 proposes a method of obtaining a good positive image by irradiating a positive color photosensitive material while increasing the illumination intensity during full-surface exposure. It was not possible to obtain a fully satisfactory positive color image.

[Object of the Invention] An object of the present invention is to provide a direct positive image forming method for obtaining a good positive image by a photofogging method using an internal latent image type direct positive photosensitive material.

[Structure 1 of the Invention The object is to have on a support two or more silver halide emulsion layers each containing internal latent image type silver halide grains whose grain surfaces are not coupled in advance and having different photosensitive wavelength regions. A method of directly forming a positive image by exposing a silver halide photographic material to light after image exposure, prior to development processing, or during the development process, in which the illuminance of the entire surface exposure is adjusted continuously or stepwise. Achieved by a direct positive image forming method in which irradiation is performed while changing the amount of light, and the ratio of the magnitude of the photographic effect of the whole surface exposure to each of the silver halide emulsion layers is 20 or less. be done.

[Specific configuration of the invention] During the entire surface exposure in the present invention, the illuminance is continuously adjusted to
Alternatively, as a method of applying the exposure illuminance while changing it in stages, there may be cases where the optimum exposure illuminance pattern is slightly different depending on the purpose of use, performance, etc. of the silver halide photographic light-sensitive material, but for example, the first
As shown in figures (a), (b), (c), (d), (e), and (f), not only a simple continuous increase in illuminance or a stepwise increase in illuminance, but also the start of exposure. The first stage in which the change pattern of increase and decrease in illuminance changes in a complex manner from the time of the maximum illuminance.
It also includes those shown in Figures (G), (H), and (S). Specifically, it is described in Japanese Patent Publication No. 58-6936.

The optical fogging method according to the present invention is intended to artificially adjust the illuminance, and the optical fogging method using a gradual increase in the exposure amount depending on the lighting characteristics of the light source when continuous exposure is performed with a single light source is not suitable for this invention. The invention is not effective. Further, in the present invention, the present invention can be advantageously implemented by combining two or more types of light sources with different illuminances.

The magnitude of photographic effect in the present invention refers to the magnitude of the effect that can be photographically exerted on a silver halide emulsion layer with a certain overall exposure, and is relative to each silver halide emulsion layer. can be determined.

The magnitude of the photographic effect is determined by the energy distribution of full exposure,
It depends on the spectral sensitivity distribution of each silver halide emulsion layer.

A method for determining the ratio of the photographic effect of full exposure will be specifically described below.

When the internal latent image type silver halide photographic light-sensitive material according to the present invention, which has not been subjected to image exposure, is entirely exposed to light prior to or during the development process, a silver halide emulsion layer having a certain photosensitive wavelength range is formed. The reciprocal of the exposure amount of the full-surface exposure is determined by the halogenated It is defined as the magnitude of the photographic effect of the entire surface exposure on the silver emulsion layer. The magnitude of the photographic effect for silver halide emulsion layers having different sensitive wavelength ranges is similarly determined. The ratio of the magnitudes of the photographic effects is determined from the magnitudes of the photographic effects determined above.

In the above method for determining the magnitude of the photographic effect of full-surface exposure, tests are conducted by changing the exposure interval of full-surface exposure. An example of a method for changing the exposure interval of the entire surface exposure is a neutral density filter (hereinafter referred to as an ND filter; for example, an ND filter such as a gelatin filter manufactured by Eastman Kodak Co., Ltd.) is used.
There is a method of changing the exposure amount using The ND filter may be inserted anywhere along the path of light from the light source to the photosensitive material, provided that it is used to attenuate the light equally throughout the entire exposure.

The ratio of the magnitude of the photographic effect in the present invention is determined by relatively changing the exposure amount of the entire surface exposure using the NO filter.

The method for determining the magnitude of the photographic effect of the entire surface exposure is carried out in exactly the same manner as the positive image formation process, except that the amount of exposure of the entire surface exposure is changed using an NO filter.

In other words, in the method for determining the magnitude of the photographic effect of the entire surface exposure, the entire surface exposure time is tested, which is equal to the entire surface exposure time for forming a positive image. In addition, when performing full-surface exposure during the development process, the development process J! ! The test is performed by making the time from the start to the start of full-surface exposure the same.

When the exposure amount for full-surface exposure is small, the image 11 degrees is very small, but as the exposure amount is gradually increased, the image density increases, but the dependence of image density on the exposure amount is generally determined by multiple factors. Each image formed by the silver halide emulsion layer is different.

According to the studies conducted by the present inventors, the photographic effects obtained for the plurality of silver halide emulsion layers obtained in this way were obtained in full-surface exposure in which the illuminance was continuously or stepwise changed. It has been found that a good positive image can be obtained when the entire surface is exposed such that the ratio of the sizes of the images is all 20 or less. Preferably, a full exposure is provided such that the magnitude ratio of the photographic effect is all below 1oIJ.

The silver halide photographic light-sensitive material used in the present invention has two or more internal latent image type silver halide emulsion layers each having a different sensitivity wavelength range on a support. In a preferred embodiment of the present invention, the silver halide photographic light-sensitive material comprises a blue-sensitive silver halide emulsion layer capable of forming a yellow image, a green-sensitive silver halide emulsion layer capable of forming a magenta image, and a silver halide emulsion layer capable of forming a cyan image. It consists of a red-sensitive silver halide emulsion layer. The case of such a multilayer silver halide color photographic light-sensitive material will be explained below.

In order to find the ratio of the magnitude of the photographic effect of full exposure, the obtained blue color corresponds to the yellow image, green color corresponds to the magenta image, and cyan image obtained when changing the exposure interval of the full surface exposure. Exposure that results in blue density, green density, and red density measured using red light that is 0.2 higher than the blue density, green density, and red density of an image obtained in exactly the same manner except that full-surface exposure is not performed. The amount is Eb, respectively.
E (1.

Let it be Er. In the present invention, the magnitude of the photographic effect of full exposure is 1/Eb and 1/EIJ, respectively.

It is expressed as 1/Er.

The above objects of the present invention are achieved by providing an overall exposure having a ratio of photographic effect magnitudes that satisfies all of equations (1), (2) and (3) above.

The above-mentioned good overall exposure is, of course, not limited to light-sensitive materials comprising a blue-sensitive yellow image-forming layer, a green-sensitive magenta image-forming layer and a red-sensitive cyan image-forming layer.

The image density in the present invention is measured using light having a wavelength near the maximum absorption of the image. Specifically, it is measured using monochromatic light having an intensity maximum within 20III1 of the absorption maximum wavelength of the image.

” The light source for full-surface exposure used in the present invention can be any type of light source as long as it can be adjusted so that the ratio of the magnitude of the photographic effect to each layer of the silver halide photographic light-sensitive material used is 20 or less. For example, tungsten lamps, fluorescent lamps, halogen lamps, xenon lamps,
Mercury lamps, sunlight, etc. can be used, and a combination of these can also be used.

The ratio of the magnitude of the photographic effect of the entire surface exposure can be varied in a commonly known manner so as to satisfy the above conditions. For example, the energy distribution of the light source itself can be changed, and filters such as color correction filters and color temperature conversion filters can also be used.

The entire surface exposure can also be performed using multiple light sources. In one preferred example, separate light sources for blue light, green light, and red light can be used to provide full-surface exposure.

In the present invention, the meaning that the sensitive wavelength ranges of the respective silver halide emulsion layers are different means that the spectral sensitivity distributions are not completely the same, and the respective sensitive wavelength ranges may partially overlap.

In the present invention, it is possible to form images using at least two silver halide emulsion layers that are sensitive to different wavelength regions, but it is preferable to select a layer in which the absorption wavelength regions have little overlap.

In the present invention, full-surface exposure prior to development processing means that full-surface exposure after image exposure is performed in a processing bath prior to development or after completion of processing. The treatment bath may contain additives such as reducing substances, alkaline agents, inhibitors, desensitizers, etc., if necessary.

When exposing the whole surface to light during the development process, it is preferable to carry out the exposure at the beginning of development in order to shorten the development time. is advantageous.

The surface developer used in the development process in the present invention is
C refers to a developer that does not substantially contain a silver halide solvent, and C refers to a developer that can be used in the surface developer. These include aminophenols, 3-labridones, ascorbic acid and its derivatives, reductones, phenylenediamines, etc., or mixtures thereof. Specifically, hydroquinone, aminophenol, N-methylaminephenol,
1-phenyl-3-pyrazolidone, 1-phenyl-4,
4-dimethyl-3-pyrazolidone, 1-phenyl-4-
Methyl-4-hydroxymethyl-3-pyrazolidone, ascorbic acid, N,N-diethyl-p-phenylenediamine, diethylamino-0-toluidine, 4-amino-
3-Methyl-N-ethyl-N-(β-methanesulfonamidoethyl)aniline, 4-amino-3-methyl-N
-ethyl-N-(β-humanOxyethyl)aniline, 4
-amino-3-methyl-N,N-diethyl-p~phenylenediamine, 4-amino-3-methyl-N-ethyl-
Examples include N-β-methoxyethyl-〇-phenylenediamine.

These developers are included in the emulsion in advance, and
It is also possible to act on the silver halide during immersion in the H aqueous solution.

The surface developer may further contain additives such as antifoggants and development inhibitors. It is also possible to optionally incorporate these developer additives into the constituent layers of the silver halide photographic material. Generally useful antifoggants include benzotriazoles, benzimidazoles, benzothiazoles, benzoxazoles, heterocyclic thionylenes such as 1-phenyl-5-mercaptotetrazole, aromatic and aliphatic mercapto Compounds, etc. are included. Further, a development accelerator such as a polyalkylene oxide derivative or a quaternary ammonium salt compound can also be contained in the developer.

The direct positive image forming method according to the present invention can be applied to general color photographic materials as well as US Patent No. 3.087 by Rogers.
．． No. 817, No. 3,185,567 and No. 2.9
No. 83,606, U.S. Patent No. 3,25 to Weyertz et al.
No. 3,915, U.S. Pat. No. 3,227 to Whitemore et al.
．． No. 550, U.S. Patent No. 3.227.551 to Barr et al.
Whitemore, U.S. Pat. No. 3,227,552, and Rand, U.S. Pat. No. 3,415,644;
．． It is also applicable to the color image transfer method, color diffusion transfer method, and absorption transfer method as described in the specifications of No. 415.645 and No. 3.415.646.

The internal latent image type silver halide emulsion in the present invention is an emulsion having silver halide grains that mainly form a latent image inside the silver halide grains and has most of the photosensitive nuclei inside the grains, and is optional. Silver halides such as silver bromide, silver chloride, silver chlorobromide, silver iodobromide, silver chloroiodide and the like are included.

In the internal latent image type silver halide grains in the present invention, it is preferable that the grain surface is not chemically sensitized, or even if it is sensitized, it is only to a slight extent.

In the present invention, the meaning that the surface of the silver halide grains is not coupled in advance means that a test piece coated with the emulsion used in the present invention on a transparent support at a ratio of 35111 gA (1/d 12) is The following surface developer [
A] means that the density obtained when developed at 20° C. for 10 minutes does not exceed 0.6, preferably 0.4.

Surface developer [A] Metol 2.5 g2-Ascorbine M 10 gNa 802-
4H2035 (J KBr 1 g water added) 12 Furthermore, the silver halide emulsion of the present invention is sufficiently developed when the test piece prepared as described above is exposed and then developed with an internal developer [B] having the following formulation. It gives a certain concentration.

Internal developer [B] Metol 2g Sodium sulfite (anhydrous > 900 Hydroquinone
8g Soda carbonate (-water salt)
52.50KBr
5gKI
Q. Add 5 g of water. 12 More specifically, a portion of the specimen is exposed to a light intensity scale for a defined period of time up to about 1 second, and the internal developer [B] Another part of the specimen exposed under the same conditions when developed for 10 minutes at ℃
at least 5 times, preferably at least 1 times, that obtained when developed in surface developer A at 20° C. for 10 minutes.
This shows the maximum concentration of 0 times.

Specifically, for example, conversion type silver halide emulsions described in U.S. Pat. No. 2,592,250, U.S. Pat. Nos. 3,761,266 and 3.76;
Core/shell type silver halide emulsion doped with internal chemical sensitizing nuclei or polyvalent metal ions as described in No. 1.276, JP-A-50-8524, JP-A-50-3852
Examples include the multilayer silver halide emulsions described in No. 5 and No. 53-2408, and the emulsions described in JP-A-52-156614 and JP-A-55-127549. can.

The silver halide emulsion in the present invention may be optically sensitized with a commonly used sensitizing dye. Combinations of sensitizing dyes used for supersensitization of internal latent image type silver halide emulsions, negative-working silver halide emulsions, etc. are also useful for the silver halide emulsions of the present invention. Regarding sensitizing dyes, see Research Disclosure t-(Research
Reference may be made to D 1closure ) N 0.15162 and N 0.17643.

In the silver halide emulsion used in the present invention, in order to suppress the surface sensitivity as low as possible, lower the minimum concentration, and impart more stable properties, commonly used stabilizers are used, such as compounds having an azaindene ring and a heterocyclic ring having a mercapto ring. Even if it contains a compound of formula (typical examples include 4-hydroxy-6-methyl-1.3.3a, 7-tetrazaindene and 1-phenyl-5-mercaptotetrazole, respectively). good.

For example, triazole compounds, azaindene compounds, benzothiazolium compounds, etc. may be used as antifoggants or stabilizers in the silver halide emulsion used in the Ikemi invention.

Various photographic additives may optionally be added to the silver halide emulsion in the present invention. Examples of wetting agents include dihydroxyalkanes, and examples of film property improving agents include copolymers of alkyl acrylates or alkyl methacrylates and acrylic acid or methacrylic acid, styrene-maleic acid copolymers, styrene maleic anhydride, etc. Water-dispersible particulate polymeric substances obtained by emulsion polymerization such as acid half-alkyl ester copolymers are suitable, and examples of coating aids include saponin, polyethylene glycol lauryl ether, and the like. Other photographic additives include gelatin plasticizers,
surfactant, ultraviolet absorber, DH adjuster, antioxidant,
It is optional to use antistatic agents, thickeners, graininess improvers, dyes, mordants, brighteners, development rate regulators, matting agents, and the like.

The silver halide emulsion produced by UA as described above is coated on a support via a subbing layer, an antihalation layer, a filter layer, etc. as necessary, to obtain an internal latent image type silver halide photographic light-sensitive material. .

The silver halide photographic material of the present invention may contain cyan, magenta and yellow dye-forming couplers in each of the at least three internal latent image type silver halide photographic emulsion layers.

Among these, yellow dye image-forming couplers include benzoylacetanilide type, pivaloylacetanilide type,
Alternatively, it is a 2-equivalent yellow dye image-forming coupler in which the carbon atom at the coupling position is substituted with a substituent that can be separated during the coupling reaction (a so-called split-off group), and is suitable as a magenta dye image-forming coupler. , 5-pyrazolone type, pyrazolotriazole type, pyrazolinobenzimidazole type, indashilon type, or a two-equivalent type magenta dye image-forming coupler having a split-off group, and as cyan dye image-forming couplers, phenol type, naphthol type, cyan dye image-forming couplers having a pyrazoloquinazolone system, or a split-off group.

In addition, in order to prevent color fading of dye images due to short-wavelength actinic rays, it is useful to use ultraviolet absorbers, such as thiazolidone, benzotriazole, acrylonitrile, and benzophenone compounds.
It is advantageous to use 20, 326, 327, and 328 (all manufactured by Ciba Geigy) alone or in combination.

Any support can be used for the silver halide photographic light-sensitive material used in the present invention, but typical supports include polyethylene terephthalate film, polycarbonate film, and borisdylene film, which are undercoated as necessary. Film, polypropylene film, cellulose acetate film, glass, baryta paper, polyethylene laminated paper, etc.

As the hydrophilic binder for the photographic constituent layers such as the emulsion layer, intermediate layer, filter layer, backing layer, and protective layer of the silver halide photographic light-sensitive material used in the present invention, in addition to gelatin, suitable gelatin may be used depending on the purpose. Derivatives can be used. Suitable gelatin derivatives include, for example, acylated gelatin, guanidylated gelatin, carbamylated gelatin,
Examples include cyanethanolated gelatin and esterified gelatin. In addition, other commonly used hydrophilic binders may be included depending on the purpose, and the hydrophilic binder may further contain a plasticizer, a lubricant, etc.

Further, the photographic constituent layers of the silver halide photographic light-sensitive material can be hardened with any hardening agent. These hardening agents include, for example, chromium salts, zirconium salts, aldehyde types such as formaldehyde and mucohalogen acids, halotriazine types, polyepoxy compounds, ethyleneimine types,
Examples include vinyl sulfone hardeners, acryloyl hardeners, and the like.

In addition, the silver halide photographic material of the present invention has a number of various photographic constituent layers such as an emulsion layer, a single filter layer, an intermediate layer, a protective layer, a subbing layer, a backing layer, and an antihalation layer on a support. It is possible to do so.

[Examples] The present invention will be illustrated below with reference to Examples, but the embodiments of the present invention are not limited thereto.

Example-1 A core/shell emulsion was prepared as follows. While controlling the temperature of an aqueous solution containing gelatin at 50° C., equimolar amounts of a silver nitrate aqueous solution and a potassium bromide aqueous solution were simultaneously added over a period of 40 minutes by a controlled double jet method to obtain a 0.35 μm cubic silver bromide emulsion. To the core emulsion thus obtained were added 2.0-0 mg of sodium thiosulfate per mole of silver and 3.0 mg of potassium chloroaurate per mole of silver,
Chemical ripening was performed at 55°C for 120 minutes. To the obtained emulsion, an aqueous FI4 acid silver solution and an aqueous potassium bromide solution were added at the same time to obtain a 0.5 μm cubic silver bromide emulsion. To the thus obtained core/shell emulsion were added 2.0 mg of sodium thiosulfate per mole of silver and 2.01 mg of potassium chloroaurate per mole of silver, and chemical ripening was performed at 55° C. for 90 minutes. . The emulsion thus obtained is designated as Emulsion-A.

Divide emulsion A, and make a green-sensitive emulsion by spectrally sensitizing one part using dye [I] below, and spectrally sensitizing another part using dyes [n] and [I [[]. to make a red-sensitive emulsion,
Another portion was made into a blue-sensitive emulsion without spectral sensitization.

Margin dye [I] Dye [I [] Dye [I [[] CCH2), 5ojNa The following layers were sequentially coated on a resin-coated paper support.

(1) Red-sensitive emulsion layer The above-mentioned red-sensitive emulsion (5111(]/di in terms of silver)
2) and 2,4-dichloro-3-methyl-6-[α, which is an oil-protected dispersed cyan coupler.
-(2,4-di-tert-amylphenoxy)butyramido]phenol (0.45 per mole of silver halide)
mole).

(2) Intermediate layer oil protection containing dispersed 2,5-di-tert-octylhydroquinone.

(3) Green-sensitive emulsion layer The above-mentioned green-sensitive emulsion (5 ma/dt2 in terms of silver) and 1-(2,4,6-drichlorophenyl)- which is a magenta coupler dispersed with oil protection.
3-(2-chloro-5-octadecylsuccinimideanilino)-5-pyrazolone (0 per mole of silver halide)
．． 25 mol).

(4) Yellow filter with yellow colloidal silver and oil protection dispersed 2
, 5-tert-octylhydroquinone.

(5) Blue-sensitive emulsion layer The above-mentioned blue-sensitive emulsion (6so/df in terms of silver) and α-[4-(1-benzyl-2=phenyl-3), which is an oil-protected yellow coupler, are combined. ,5
-dioxo-1,2,4-driazolidinyl)]-]α
-Vivalyl 2-chloro=5-γ-(2,4-dite
rt-amylphenoxy)butylamitocoacetanilide (0.45 mol/mol silver halide).

(6) Protective layer gelatin layer.

After drying, the obtained sample is designated as sample-1.

While controlling the temperature of an aqueous solution containing gelatin at 50° C., equimolar amounts of a silver nitrate aqueous solution and a potassium bromide aqueous solution were simultaneously added over 90 minutes by a controlled double jet method to obtain a 0.9 μm cubic silver bromide emulsion. Sodium thiosulfate 1.0'mg per mole of silver thus obtained
Then, 2.0 mg of potassium chloroaurate per mole of silver was added, and chemical ripening was performed at 55° C. for 180 minutes. A silver nitrate aqueous solution and a potassium bromide aqueous solution were added simultaneously to the obtained emulsion to obtain a 1.0 μm cubic silver bromide emulsion. A silver nitrate aqueous solution and a potassium bromide aqueous solution were simultaneously added to the emulsion thus obtained to obtain a 1.0 μm cubic silver bromide emulsion. To the core/shell emulsion thus obtained were added 1.0 mg of sodium thiosulfate and 1.5 mg of potassium chloroaurate per mole of silver, and chemical ripening was performed at 60° C. for 120 minutes. The emulsion thus obtained is designated as Emulsion-B.

Emulsion B was spectrally sensitized using the following dye [rV] to obtain a blue-sensitive emulsion.

Dye [rV] Sample-2 was obtained in exactly the same manner as Sample-1 except that the emulsion thus obtained was a blue-sensitive emulsion.

Sample-1 and Sample-2 were each exposed to light (hereinafter referred to as wedge exposure) through an optical model for sensitometry using a sensitometer. Using xenon light as a light source, the entire surface was exposed for 20 seconds under the exposure conditions shown below.

Full-surface exposure condition (1) After exposure for 10 seconds at an illuminance of 0.25 lux, it was immediately exposed for 10 seconds at an illuminance of 10 lux.

(2) The entire surface was exposed in the same manner as in (2), but through a yellow filter for color correction (blue density DB = 0.3). However, the illuminance in this case is the value measured without passing through the yellow filter.

■ The same procedure as in ■ was carried out, but DB = 0.6.

■ The same procedure as in ■ was carried out, but DB = 0.9.

■ The same procedure as in ■ ■ was carried out, but DB = 1.2.

■ The same procedure as in ■ was carried out, but DB = 1.5.

■ The line was similar to ■, but DB = 1.8.

■ The same procedure as ■ was carried out, but the result was D, -2,1.

■ The same procedure as ■ was carried out, but for DB-2 and DB-4.

Each sample was developed at 20° C. for 5 minutes using a developer having the composition shown below. However, the above-mentioned whole surface exposure was started 20 seconds after each sample was immersed in the developer.

4-Amino-3-methyl-N-ethyl-N-(β-methanesulfonamidoethyl)aniline sulfate 5g Sodium sulfite (anhydrous) 29 Sodium carbonate (-hydrate) 15g Potassium bromide 1g Benzyl alcohol 10d Add water hand
12 Then bleach in the usual way,
It was fixed, washed with water, and dried. Maximum density (Dmax) and minimum density ([) for the positive image obtained for each sample
win) was measured. The results are shown in Table-1 and Table-2.
Shown below.

In addition, the overall image evaluation was indicated by ○ (good) or × (poor).

Next, the ratio of the magnitude of the photographic effects of the above-mentioned full-surface exposures from (1) to (2) was determined as follows.

A portion of Sample-1 and Sample-2 were developed, bleached, and fixed in the same manner as described above, without applying wedge exposure or completely exposing the entire surface to light. The image density obtained for Sample-1 was 0.12 for yellow, 0.11 for magenta, and 0.07 for cyan.

A part of Sample-1 above was subjected to full-surface exposure as described in (2) above without applying wedge exposure. Full-surface exposure was performed using an NO filter with a different filter. However, the entire surface exposure, development, bleaching, fixing, and water washing were performed in the same manner as for the wedge-exposed sample. The image density of each sample obtained was measured, and the density of the ND filter required to obtain an image density factor of 0.2 for the sample was calculated for each of yellow, magenta, and cyan when the above-mentioned entire surface exposure was not performed. However, it was 2.35 for yellow, 1.96 for magenta, and 1.30 for cyan. In the present invention, the ratio of the magnitude of the photographic effect of full exposure (2) is as follows. In the case of the above-mentioned full-surface exposure (3), all b are satisfied, and this is the full-surface exposure of the present invention.

In the same manner, the ratio of the magnitude of the photographic effects of the full-surface exposures ① to ② was determined for Sample-1 and Sample-2. The obtained results are shown in Table-3 and Table-4.

Margin Table-3 (Sample-1) Table-4 (Sample-2) As is clear from the above results, a positive image with a large maximum density and a small minimum density can be obtained by performing full-surface exposure according to the present invention. I know that it will happen. This also provides satisfactory image characteristics for each dye image in a multilayer configuration. Furthermore, the range of conditions for full-surface exposure in which a good photographic image can be obtained is different between the case of using Sample-1 and the case of using Sample-2, but the method of the present invention provides good results even when the photosensitive material is changed. It can be seen that it is difficult to obtain a clear image using methods other than the present invention.

Example-2 Wedge exposure was performed using Sample-2 obtained in Example-1. Using a white fluorescent lamp as a light source, the entire surface was exposed for 10 seconds as follows. That is, after being exposed for 8 seconds at an illuminance of 0.3 lux, it was immediately exposed for 2 seconds at an illuminance of 5 lux. Full exposure was performed in exactly the same way using the same fluorescent lamp, but with a magenta filter for color correction (green density = 1.0)
exposed through. However, the illuminance at this time is a value measured without passing through a magenta filter.

Each sample was developed, bleached, fixed, and washed with water in the same manner as in Example-1. Table 5 shows the results of measuring the maximum density and minimum density values for the positive images obtained for each sample. Further, Table 6 shows the measured values of the ratio of the magnitude of the photographic effect upon full exposure.

From the results shown below in the margins, it can be seen that by performing the entire surface exposure of the present invention, it is possible to obtain a good positive image with a large maximum density and a small minimum density.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1(A) to 1(S) show examples of changes in illuminance during full-surface exposure in the method of the present invention, and are shown as exposure patterns of various shapes. Patent applicant: Konishiroku Photo Industry Co., Ltd. Figure 1, 7. 1985 Patent Application No. 180179 2, Name of the invention Direct positive image forming method 3, Relationship with the amendment person case Patent applicant address Tokyo 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name
(127) Representative Director of Konishiroku Photo Industry Co., Ltd.
Utter: Keio 4, Agent: 102 Address: Kuchisaka Building, 4-1-1 Kudankita, Chiyoda-ku, Tokyo Telephone: 263-9524 The column for the detailed description of the invention in the specification has been amended as follows. (1) Mei II Yen, page 9, lines 17-18, “Tokuko 1983
- It is described in No. 693f3. ” as T1. :Corrected. The method described in No. 11il 58-G!I3G can be used as a reference. For example, with the type of light source constant, the illuminance can be adjusted by changing the voltage, current, etc. applied to the light source during full-surface exposure. You may change it by using filters such as a neutral density filter, or you may change the distance between the light source and the photosensitive material, or you may change the angle of incidence of the irradiated light entering the photosensitive material. (2) Insert the following sentence between lines 7 and 8 on page 13 of the specification. . As mentioned above, in J3 of the positive image forming method of the present invention, an experiment was repeated in which, when the silver halide rotational photosensitive material was kept constant, the illuminance of the entire surface exposure was changed at least once during the entire surface exposure. Then, the ratio of the size of the direct effect determined for the plurality of silver halide emulsion layers of the photographic material r1 was determined, and the ratio of the photographic effect was determined to be within the range of the present invention. It is possible to determine the exposure conditions in which the illuminance of the entire surface exposure of the present invention is changed at least once during the entire surface exposure by checking the full surface exposure conditions in J(3) Specification page 15, line 3. r2O
"Within n'll1". (4) A cubic silver bromide emulsion of [1,θμ] was obtained on page 39 of the specification, lines 5 to 8. To the emulsion thus prepared, a lil'lll silver aqueous solution and an odor-stopping aqueous solution were simultaneously added to obtain a 1.0 μm cubic silver bromide emulsion. Correct ``in this way'' as follows. A cubic silver bromide emulsion of 11.0 μm was obtained. (5) Table 3 on page 39 of the specification is corrected as follows. Table-3 (Sample-1) "Human-hi."

Claims (1)

[Claims] A silver halide photographic light-sensitive material having two or more silver halide emulsion layers each containing internal latent image type silver halide grains whose grain surfaces are not coupled in advance and having different photosensitive wavelength regions on a support is imagewise exposed. After that, before the development process,
Or, in a method of directly forming a positive image by applying full-surface exposure during the development process, the entire surface is exposed while changing the illuminance continuously or stepwise, and
A method for forming a direct positive image, characterized in that the ratio of the photographic effect of the entire surface exposure to each of the silver halide emulsion layers is 20 or less.