JPH01102534A - Image forming method - Google Patents

Abstract

PURPOSE:To inexpensively and easily subject a silver halide photosensitive material having photosensitivity in an IR region to image exposing by applying the image exposing to the silver halide photosensitive material having the photosensitivity in the IR region by a cathode ray tube having a phosphor which emits the fluorescence of the IR region. CONSTITUTION:The image exposing is applied to the silver halide photosensitive material having the photosensitivity in the IR region by the cathode ray tube having the phosphor which emits the fluorescence of the IR range. The electrode ray excitation type phosphor which emits light in the IR region is exemplified by, for example, the phosphor expressed by MgY2-xS:Cex. An IR-cut filter is preferably used in combination in order to obtain the image having excellent color reproducibility in the case of multicolors. A filter which cuts >=720mmu in particular is preferable as the IR-cut filter. The reason thereof lies in that many of the red phosphors emit the fluorescence between 700-720mmu and that the use of 700-720mmu as a red exposing part is more advantageous.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an image forming method, and particularly to an image forming method in which an image is exposed using a cathode ray tube having a phosphor that emits fluorescence in at least an infrared region.

(Prior Art and its Problems) Various methods are known in which image information is converted into an electrical signal, and a photographic image is obtained by exposing a silver halide photosensitive material by operating a light emitting source based on the electrical signal.

It is also known that a cathode ray tube (CRT) that emits fluorescence is used as a light emitting source to impart imagewise exposure to a silver halide photosensitive material, and then is developed to obtain a photographic image.

However, there is no known method for recording color images using conventional cathode ray tubes that emit fluorescence in the infrared region.

On the other hand, with the development of LEDs, semiconductor lasers, etc., silver halide photosensitive materials that are sensitive to the infrared region have been developed. However, in order to perform exposure using LEDs or semiconductor lasers, it is necessary to use an LE that connects many LEDs or semiconductor lasers.
It is necessary to use a D array or semiconductor laser array, or to scan light from an LED or semiconductor laser. The former has the problem of high cost because it uses a large number of LEDs and semiconductor lasers, and furthermore, the deterioration of these many light emitting sources does not necessarily occur uniformly, resulting in unevenness in photographic images after long-term use. There are also problems that arise. Moreover, the latter case has the problem of requiring optically and mechanically complex equipment.

Therefore, it has been desired to develop a method for imagewise exposing silver halide photosensitive materials having sensitivity in the infrared region at a lower cost and more easily.

(Means for Solving Problems) Various problems in the above-mentioned conventional techniques are solved by using a cathode ray tube having a phosphor that emits fluorescence in at least an infrared region in a silver halide photosensitive material that is sensitive to at least an infrared region. It has been found that the problem can be solved by an image forming method characterized in that image exposure is provided.

The present invention will be explained in detail below.

The cathode ray tube used in the present invention has an electron beam-excited phosphor that emits light at least in the infrared region on its phosphor screen.

Examples of electron beam-excited phosphors that emit light in the infrared region include MgY, which is described in JP-A No. 61-296647.
A phosphor represented by z-xS:Ce (here, X is 0
．． 0001-0.05 is shown. For example, MgY+, *q
qSa:Ceo, oo+), JP-A-51-1209
Examples include phosphors described in No. 86 and No. 51-120987.

To manufacture a cathode ray tube using these phosphors that emit light in the infrared region, the same method as that used for manufacturing ordinary cathode ray tubes can be applied. For example, the above-mentioned Japanese Unexamined Patent Publication No. 61-296647 also describes a method for manufacturing a cathode ray tube, and this method can be applied. At this time, in addition to a phosphor that emits light in the infrared region, one or more of phosphors that emit light in other spectral regions, such as a red-emitting phosphor, a green-emitting phosphor, or a blue-emitting phosphor, may be used as necessary. May be used together. The spectral range is not limited to the above-mentioned red, green, and blue, and phosphors that emit light in various ranges such as yellow and orange can be used.

In the present invention, as a method of exposing the photosensitive material, the photosensitive material may be exposed by being brought into close contact with the tube surface of a cathode ray tube, or may be exposed through an optical system such as a lens or fiber optics.

In the case of multicolor (when the photosensitive material has multiple photosensitive layers and the cathode ray tube also has phosphors that emit light in multiple spectral regions), multiple colors are exposed at once (when the cathode ray tube has multiple color images) It is also possible to use a filter that inputs a signal to emit multiple colors from the tube surface, or inputs an image signal for each color sequentially, causes each color to emit sequentially, and cuts out the colors outside of that color plate. Alternatively, a method may be used in which a light source is provided and exposed.

In addition, in the case of multi-color images, ordinary sharp-cut filters and band-pass filters often transmit infrared light.For example, when exposing with a red filter or green filter, in order to obtain an image with excellent color reproduction, it is necessary to It is desirable to use an infrared cut filter in combination, and a preferable infrared cut filter is a filter that cuts 700 mμ or more, particularly 720 mμ or more. This is because many red phosphors emit fluorescence between 700 and 720 mμ, and it is advantageous to use 700 to 720 IIlμ as the red exposure area.

The silver halide photosensitive material used in the present invention only needs to have at least an infrared photosensitive layer. That is, the photosensitive material may consist of only an infrared light-sensitive layer as a light-sensitive emulsion layer, or it may consist of an infrared light-sensitive layer and a light-sensitive layer having photosensitivity in other spectral regions. Photosensitive layers sensitive to other spectral regions include:
There are a red photosensitive layer, a green photosensitive layer, a yellow photosensitive layer, and a blue photosensitive layer. In addition, photosensitive materials composed of a combination of these layers include photosensitive materials composed of an infrared light-sensitive layer and a red light-sensitive layer;
A photosensitive material consisting of an infrared photosensitive layer and a green photosensitive layer, a photosensitive material consisting of an infrared photosensitive layer and a blue photosensitive layer, a photosensitive material consisting of an infrared photosensitive layer, a red photosensitive layer and a green photosensitive layer, an infrared photosensitive material Typical examples include a photosensitive material comprising a red photosensitive layer and a yellow photosensitive layer.

When forming a color image, the combination of this photosensitivity and the hue of the image-forming dye may be any combination. For example, the infrared light-sensitive layer may be a cyan dye layer, the red light-sensitive layer may be a magenta dye layer, and the green light-sensitive layer may be a magenta dye layer. .

Yellow dye layer; infrared layer is magenta dye layer, red layer is cyan dye layer, green layer is yellow dye layer; infrared layer is yellow dye layer, red layer is magenta dye layer, green layer is yellow dye layer, etc. Others are possible. All combinations can be implemented.

Further, the infrared-sensitive layer may have a two-layer structure of a high-frequency layer and a low-frequency layer, or a three-layer structure. The other photosensitive layers may also have a two-layer structure or a three-layer structure.

The layer arrangement may be any arrangement such as an infrared light-sensitive layer, a red light-sensitive layer, or a green window light layer from the support side.
In terms of sensitivity and sharpness, from the support side it is desirable to have a cyan dye layer sensitive to infrared light, then a magenta dye layer sensitive to red light, and then a yellow dye layer sensitive to green or yellow light as the upper layer.

The silver halide that can be used in the light-sensitive material of the present invention may be silver chloride, silver bromide, silver chlorobromide, silver chloroiodide, or silver chloroiodobromide.

Specifically, U.S. Pat. No. 4,500,626, column 50;
Research Disclosure Magazine, June 1978 issue, pages 9-10 (RD 17029), JP-A-61-10
No. 7240, No. 62-85241, No. 62-8795
Any of the silver halide emulsions described in No. 7 and the like can be used.

The silver halide emulsion used in the present invention may be of the surface latent image type in which latent images are mainly formed on the grain surfaces, or may be of the internal latent image type in which the latent images are formed inside the grains. It may also be a so-called core-shell emulsion in which the inside of the grain and the surface layer of the grain have different phases. Further, in the present invention, a direct reversal emulsion in which an internal latent image type emulsion is combined with a nucleating agent and/or a photofog can also be used.

The silver halide used in the present invention may be spectral sensitized with methine dyes or others. In particular, in order to obtain silver halide sensitive to the infrared region, spectral sensitization may be performed with an infrared sensitizing dye. Let's do it. The dyes used include cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, holopolar cyanine dyes, hemicyanine dyes, styryl dyes and hemioxonol dyes.

Specifically, Japanese Patent Publication Nos. 59-180550 and 59-1
No. 80553, No. 60-196757, No. 60-14
No. 0335, Research Disclosure Magazine 1978
Exacerbating pigments described in June issue, pages 12-13 (RD17029), and JP-A-60-111239, JP-A-62-32.
Thermal decolorizing exacerbating dyes described in No. 445 and the like can be mentioned.

These enhancing dyes may be used alone or in combination, and combinations of enhancing dyes are often used particularly for the purpose of supersensitization.

Along with aggravating pigments, pigments that do not themselves have spectral sensitizing effects or substances that do not substantially absorb visible light,
A substance exhibiting supersensitization may be included in the emulsion (for example, U.S. Pat. No. 2,933,390, U.S. Pat. No. 3,635,721, U.S. Pat.
3,615,641, 3,617,295, and 3,635,721).

These enhancing dyes may be added to the emulsion at or before chemical ripening, and US Pat. No. 4,183.
It may be carried out before or after the nucleation of silver halide grains according to No. 756 and No. 4,255,666.

For example, a coupler-type color photographic material can be used in the present invention. Examples of color photosensitive materials include color negative film for photography (general use, professional use, movie use, etc.), color reversal film, color photographic paper, color reversal photographic paper, cinema body, and the like.

The present invention is based on, for example, The Theory of theP.
Photographic Process, Cha
pter 12+ Pr1nciplesand
Chemistry of Co1or Pho
tography IV.

5ilver dye bleach procedure
ss, 4th ed., T.H.

James ad, + Macmillan, N
ew York, 197'L p363-366
It is also possible to use a silver dye bleaching method such as that described in .

In the present invention, it is also possible to use a black-and-white photosensitive material that undergoes conventional wet processing. Examples of black-and-white photosensitive materials include 1. X-ray film, black-and-white photographic film, lithographic film, and scanner film.

In the present invention, heat-developable photosensitive materials for forming monochrome images or color images can also be used. The present invention particularly relates to a method in which a mobile dye is imagewise released by thermal development, and the mobile dye is transferred to a dye fixing element having a mordant using a solvent such as water; A method in which the dye is transferred to a dye-fixing element using a hydrophilic heat solvent built into the dye-fixing element, a method in which a mobile dye is heat-diffusible or sublimable and is transferred to a dye-receiving element such as a support, etc. Suitable for transfer-type heat-developable color photosensitive materials. Such heat-developable color photosensitive materials are described in detail in U.S. Pat.
It is described in EP220.746A2, Technical Report 87-6199, etc.

Regarding these heat-developable photosensitive materials, Japanese Patent Application Laid-Open No. 60-26
The base precursor described in No. 9147 etc., BP2
It is advantageous to incorporate a base generating means into the image forming reaction system, such as the method described in 10.66OA2 for generating a base using a complex formation reaction.

When a small amount of water is used in a heat-developable photosensitive material, methods for applying water to the photosensitive layer or dye fixing layer include, for example, JP-A-61-147244, p. 101, lines 9 to 102.
There is a method described on page 4, line 4. “Development and/or
Alternatively, as heating means in the transfer step, there are means such as a hot plate, an iron, and a hot roller as described in JP-A-61-147244, page 102, line 14 to line 103, line 11.

Alternatively, a layer of conductive material such as graphite, carbon black, metal, etc. may be applied to the photosensitive element and/or the dye fixing element, and the conductive layer may be heated directly by passing an electric current through the layer. .

The pressure conditions and method of applying pressure when overlapping the photosensitive element and the dye fixing element and bringing them into close contact are described in Japanese Patent Application Laid-Open No. 1472-1986.
The method described in No. 44, pages 103 to 104 can be applied.

Any of a variety of thermal development equipment can be used to process the photographic elements of this invention. For example, JP-A No. 59-75247,
Apparatuses described in Japanese Utility Model No. 59-177547, No. 59-181353, No. 60-18951, Japanese Utility Model Application Publication No. 62-25944', etc. are preferably used.

Example Y2O2S:Eu as a red phosphor, ZnS: Cu, Au+ AI as a green phosphor, MgYz-xs4 (x-0,0001 to 0.05) as an infrared phosphor
Using this, a color picture tube (cathode ray tube) was made.

A photothermographic material identical to Sample 101 of Example 1 of JP-A-62-160447 was prepared.

In front of the color picture tube, use Fuji Photo Film Sharp Cut Filter 5C72 (transmits over 720 mμ)
After that, a heat-developable photosensitive material was attached, and image exposure was performed by scanning the electron beam of the picture tube with a cyan image signal.

A cyan photographic image was obtained on the zero dye fixing material by processing this photosensitive material in accordance with Example 1 of JP-A-62-160447.

Next, perform cyan image exposure in the same manner as above, then attach an infrared cut filter (cuts 720+sμ or more) and Fuji Photo Film 5P-3 (red filter), then attach a photosensitive material to create a magenta image. The signal was used to scan the electron beam of the picture tube, and the magenta image was exposed over the cyan image.

Similarly, an infrared cut filter and Fuji Photo Film's 5P-2 (green filter) were attached, and yellow image information was scanned for overlapping exposure.

This means that image information of three colors, cyan, magenta, and yellow, is recorded on the photothermographic material.

This was subjected to heat development treatment in the same manner as above. A full color image was obtained on the dye fixing material.

Claims (1)

[Claims] 1. An image forming method comprising applying imagewise exposure to a silver halide photosensitive material having photosensitivity in at least an infrared region using a cathode ray tube having a phosphor that emits fluorescence in at least an infrared region.