JPS6247046A - Positive image forming method - Google Patents

Abstract

PURPOSE:To adjust the exposure illuminance, illuminance distribution, and spectral distribution of a fog light by changing the light transmission quantity of a photoconductive member so that the intensity of incident light is increased in the carrying direction of the photosensitive face of internal latent image type silver halide photographic sensitive materials. CONSTITUTION:In a stage where a sensitive material 1 is carried in the direction of an arrow by carrying rolls 10 and 10', the sensitive material 1 is exposed to the light transmitted through a filter A and is exposed next to the light transmitted through a filter B. Since the filter density of the filter A is higher than that of the filter B, fog exposure is given where the intensity of the light incident on the photosensitive face of the sensitive material 1 is increased stepwise. The manner of setting of the intensity of incident light in the carrying direction of the photosensitive face of the sensitive material 1 is calculated in accordance with the correct exposure in relationsto the intensity of light and the running speed. Thus, stable fog exposure is performed easily to obtain good positive images finally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention provides a method for producing positive images by subjecting an image-exposed internal latent image type silver halide photographic light-sensitive material to fog exposure prior to or during the development process. The present invention relates to a method of forming an image, and more particularly to a method of forming a positive image that can perform fog exposure to obtain a stable image.

[Background of the Invention] It is well known that a positive image can be directly obtained by developing an internal latent image type silver balogenide photographic light-sensitive material while subjecting it to a photofogging treatment.

In order to improve the image characteristics of internal latent image type silver halide photographic light-sensitive materials, a high-temperature image is formed by increasing the illuminance at the time of light fogging, and the fogging exposure time is To shorten the
No. 936.

Furthermore, as one means for obtaining soft positive image characteristics, a method is known in which two or more types of internal latent image type silver halide grains with different grain sizes or sensitivities are contained in an emulsion. In this case, the above-mentioned method of performing fog exposure while increasing the illuminance during fogging is particularly effective. Therefore, a specific fog exposure method suitable for increasing illuminance is desired.

Furthermore, in order to correct differences in performance between manufacturing lots of photosensitive materials and the effects of coloring of the developer, a fog exposure method is desired that can easily adjust the exposure illuminance, illuminance distribution, and spectral distribution of fog light.

[Object of the Invention] In view of the above-mentioned conventional circumstances, it is an object of the present invention to provide a positive image forming method that performs fog exposure that provides a stable image.

[Structure of the Invention] The above object of the present invention is to provide a method for forming a positive image by subjecting an internal latent image type silver halide photographic light-sensitive material to capri exposure after image exposure, prior to or during the development process. , a light guide member is provided in the optical path between the light source for the capri exposure and the photosensitive surface of the internal latent image type silver halide photographic light-sensitive material, and the light guide member is provided in the optical path between the light source for the capri exposure and the photosensitive surface of the internal latent image type silver halide photographic light-sensitive material. This is achieved by providing a positive image forming method in which the amount of light transmitted through the light guide member is changed so that the intensity of incident light increases in a direction.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a fog exposure apparatus used to carry out the present invention. The fog exposure device is located above the processing liquid 2 and includes a light source section 8 and a light guide member 9. The light source section 8 includes a light source 3, and the light guiding member 9 includes a light scattering plate 5 for making the light uniform, and two filters A and B with different densities (the filter densities are A>B). , a correction filter 6, and a transparent plate 7, and 4 is a casing of a fog exposure device.

As the light source 3, one having an energy distribution that can cover the entire color sensitivity range of the internal latent image type silver halide photographic light-sensitive material 1 (hereinafter referred to as the "sensitive material") used, such as a tungsten lamp, a halogen lamp, or a fluorescent lamp. It is possible to use all of the following.

Furthermore, as the light source 3, in addition to the above, it is also possible to use a cathode ray tube, a light emitting diode, an electroluminescence, etc., and the number or type of the light sources 3 does not matter whether it is singular or plural.

In addition, when using a single light emitting diode or cathode ray tube consisting of blue light, green light, and red light as the light source 3, it can be used without using an energy distribution correction filter etc. by electrically controlling each light emitting tube. I can do it.

As the correction filter 6, for example, in order to form the best positive image, a neutral filter is used to adjust the intensity of the light source 3 in accordance with the sensitivity and color sensitivity characteristics of the photosensitive material 1. Density filters, neutral density filters using white diffusers, etc., color correction filters such as cyan, magenta, yellow, etc. for adjusting the spectral energy distribution, or dichroic filters using metal vapor deposited films, etc. are arranged singly or as a unit. Things are used as needed.

Capri exposure is performed by the fog exposure device having such a configuration, and the photosensitive material 1 is first exposed to light that has passed through the filter A in the process of being conveyed in the direction of the arrow shown by the conveyance rollers 10 and 10'. , and then exposed to light passing through filter B. here,
As described above, since the filter density has the relationship A>8, capri exposure is provided in which the intensity of light incident on the photosensitive surface of the photosensitive material 1 increases stepwise.

Note that how to set the intensity of incident light with respect to the conveying direction of the photosensitive surface of the photosensitive material 1 is calculated from the appropriate exposure ω in relation to the intensity of light and the traveling speed.

FIG. 2 is a sectional view showing another embodiment of the fog exposure apparatus used to carry out the present invention.

The fog exposure apparatus of this embodiment includes a light source section 13 and a light guide member 19.

The light source section 13 consists of a light source 11 and a casing 12 containing the light source 11, and the light source section 13 is connected to the side wall 17 of the processing liquid tank.
The light emitted from the light source 11 passes through the window 18 and enters the processing liquid tank.

Further, 14 installed inside the casing 12 is a correction filter, and □15 is a light scattering plate. light source 1
1. Correction filter □-14. As the diffuser plate 15, the same one as shown in the above-mentioned first embodiment is used. Note that the above window section 18 is a transparent plate 1.
6 prevents the processing liquid 2 from entering.

On the other hand, after the image exposure of the photosensitive material 1 is completed, its photosensitive surface is moved to the light source section 1.
It enters the processing liquid tank toward the 3 side, and the transport roller pair 21.2
1' and 22, 22', while being conveyed through the processing liquid 2, it is subjected to fog exposure.

In this embodiment, a light guide member 19 is arranged in the optical path between the light source section 13 and the photosensitive surface of the photosensitive material 1 being transported. The light guiding member 19 is made of neutral glass having different light transmittances so that the intensity of incident light increases stepwise in the direction of conveyance (direction of the arrow shown) with respect to the photosensitive surface of the photosensitive material 1. It consists of blocks C, D and E (that is, the light transmittance of the glass blocks satisfies C<D<E). In addition, the side surfaces of each of the glass blocks C, D, and E are all covered with a light-shielding plate 20 except for the surface facing the light-sensitive material 1 and the light source section 13, so that the light-sensitive surface other than the light-sensitive surface to be irradiated is covered with a light-shielding plate 20. External light leakage is prevented.

In this configuration, the photosensitive material 1 is exposed to fog by the light that has passed through the glass blocks C, D, and E while being transported. Since the ratio is in the relationship C<D<E, the intensity of light incident on the photosensitive surface of the photosensitive material 1 is gradually ''''11''hhy''t*5qistt in the conveying direction of the photosensitive surface.
a.

In this embodiment, a glass block is used as the light guide member 19, but it is not limited to this, and other materials such as polyethylene, polypropylene, acrylic, nylon, vinyl chloride, etc. with good light transmittance and chemical resistance can be used. Synthetic resin materials can be used.

FIG. 3 is a sectional view showing another embodiment of a fog exposure apparatus used to carry out the present invention.

The structure of the light source section 13 in FIG. 3 is the same as that shown in FIG. 2, but the structure of the light guide member 23 is different.

That is, the light guide member 23 includes glass blocks F and G having the same light transmittance, and glass blocks F and G having the same light transmittance.
Filters H and I with different densities are provided on the surface facing the photosensitive material 1 (the size of the filter density is H>
It is I. ) and a light shielding plate 20.

In such a configuration, as the photosensitive material 1 is transported, it is first subjected to fogging exposure by the light that has passed through the glass block Fj3 and the filter H, and then is exposed to more intense light that has passed through the glass block G and the filter (2). subject to fogging exposure.

Note that other materials can also be used for the glass blocks F and G.

Further, in this embodiment, the fogging exposure intensity is increased in stages, but the invention is not limited to this, and the fogging exposure intensity can be increased continuously by continuously changing the light transmission regression of the light guide member. You can also.

[Effects of the Invention] As described in detail above, according to the positive image forming method of the present invention, stable fog exposure can be easily performed and a good positive image can be finally obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a fog exposure apparatus used to carry out the present invention, and FIGS. 2 and 3 show other embodiments of the fog exposure apparatus used to carry out the present invention. FIG. 1... Sensitive material, 2-... Processing liquid, 3.11...
・Light source, 8, 13...Light source section, 9.19.23...
・Light guide member, A, B, H, [...filter, C, D, E, F, G...Glass block patent applicant
Konishiroku Photo Industry Co., Ltd. t4. ．． :,:,+ Figure 1 Figure 2

Claims (1)

[Claims] In a method of forming a positive image by performing fog exposure on an internal latent image type silver halide photographic light-sensitive material after image exposure and prior to or during the development process, the light source for the fog exposure and the internal latent image type A light guide member is provided in the optical path between the photosensitive surface of the silver halide photographic light-sensitive material, and the light guide member is arranged so that the intensity of incident light increases in the transport direction of the photosensitive surface of the internal latent image type silver halide photographic light-sensitive material. A positive image forming method characterized by changing the amount of light transmitted through an optical member.