JPH0466949A - Exposing device and image forming method - Google Patents

Abstract

PURPOSE:To obtain black and white or full-color images with the simple heat development alone in a short period of time without generating waste by superposing an image original on a heat development type photosensitive recording medium, installing a vapor deposited film filter between a light source and the image original and exposing the original. CONSTITUTION:The light past the filter F1 passes glass 77 and the image original 18 and arrives at the photosensitive recording medium 78 to expose only the lambda1 photosensitive layer 120. Only the lambda2 photosensitive layer 116 is then exposed through a filter F2 and only the lambda3 photosensitive layer 112 is exposed through a filter F3. The photopolymn. of a polymerizable electron accepting compd. is induced by a photopolymn. initiator and the color development is no longer executed in spite of heating in the exposed parts of the respective photosensitive layers. On the other hand, the electron accepting compd. passes microcapsule walls and comes into contact with an electron donating colorless dye when heated in the unexposed parts. The color development of the electron donating colorless dye is thereby induced and positive images are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention is applicable to color or black and white proofs, slides,
Overhead projector - Exposure device for creating second original drawings, copiers, and faxes, especially for heat-developable photosensitive materials that can easily produce color images by simply heat-developing them after exposure, without using unnecessary sheets. The present invention relates to an exposure apparatus for easily imagewise exposing the photosensitive material without crosstalk, and an image forming method using the exposure apparatus.

"Prior Art" For the sake of convenience, the prior art will be explained below using color proofing as an example, but the same can be said about other fields, only the purpose of use is different.

There are various methods of color proofing, but each has its own drawbacks.

One of the typical methods of color proofing is the overlay method. This method reproduces a multicolor image by overlapping films with images of each color, and it is unavoidable to view the image through the film, resulting in poor image quality.

In addition, there is a sub-print method as a method for obtaining multicolor images on two sheets. In this method, images of each color are sequentially superimposed on a sheet of support to obtain a multicolor image. for example,
Cromarin (Dupont), Matsushi Print (3M
Inc.), Color Art (Fuji Photo Film), etc. are known, but both require four sheets of photosensitive film for each color and generate waste.

Furthermore, a color paper type is known as a method for forming color images on two photosensitive sheets. This method involves attaching a film original to color paper, exposing it to light using each color filter, and performing wet development to obtain a color image. It is being In this method, since the photosensitive range of color paper is the visible range,
A darkroom or an exposure device equipped with a darkroom is required for handling, and maintenance and management of the developer is required.

These methods have some drawbacks, such as requiring multiple sheets, generating waste such as transfer sheets and toner, being difficult to handle in a bright room, and requiring a development system that uses a developer. There is a need for improvement.

The following method has been proposed as a method that does not have these drawbacks. That is, thermal processing is characterized in that a latent image is formed on the photocurable composition by exposure, and components involved in color development or decolorization are diffused within the photosensitive material according to the latent image by heating to form a color image. Using a developable photosensitive recording medium, the photosensitive recording medium is exposed to light through the image original, photocuring occurs in the exposed area to form a latent image, and the uncured portion is then heated by heating the photosensitive recording medium. By using a color image creation method characterized by diffusing the parts involved in color development or decolorization to form a visible image, a completely dry system that does not generate waste can be realized.

There are several types of optical recording media used in this method, and although it is a unique method for recording black and white images, it is particularly useful when used as a color recording medium. .

As a specific recording medium, for example, JP-A-52-89
A medium disclosed in Japanese Patent No. 915 is known. This is because the two components of a two-component thermochromic medium, e.g.
It is a medium in which an electron-accepting compound and an electron-donating colorless dye are separately arranged inside and outside or on both sides of a microcapsule containing a photocurable composition. However, in the case of this medium, even if the photocurable composition in the microcapsules is sufficiently cured, color development in the cured areas cannot be sufficiently suppressed, so non-image areas tend to be slightly colored, resulting in poor contrast. be.

A more preferable medium without coloring of the non-image area is, for example, a photopolymerizable composition comprising a vinyl monomer having an acidic group and a photopolymerization initiator, as disclosed in JP-A-61-123838. A recording medium is known in which a layer containing an electron-donating colorless dye, an isolation layer, and a layer containing an electron-donating colorless dye are stacked together. In the case of this medium, the thermal diffusivity of the acidic groups in the non-image area, that is, the area cured by the photopolymerization part, is almost eliminated, so there is no coloring in the non-image area, but the coloring density is somewhat low.

For example, to obtain a negative image using a similar method,
There is a method disclosed in Japanese Unexamined Patent Publication No. 119552/1983. This method uses a recording medium in which a photopolymerizable composition consisting of a monomer or prepolymer that bleaches a dye and a photopolymerization initiator and a dye that is bleached by the monomer or prepolymer are present separately. This medium also has the same drawbacks as the aforementioned media.

The most preferable medium that overcomes the coloration of non-image areas and low image density is disclosed in Japanese Patent Application No. 1-22 filed by the present applicant.
There is a medium described in No. 4930.

In this medium, one of the two components of a two-component thermosensitive coloring medium is encapsulated in microcapsules, and the other component is used as a curable compound of a photocurable composition, or the other component is used together with the photocurable composition in microcapsules. A medium placed outside the capsule.

As a negative image medium using a similar concept, there is a medium described in Japanese Patent Application No. 2-19710 filed by the present applicant. A photopolymerizable composition containing an electron-accepting compound, a polymerizable vinyl monomer, and a photopolymerization initiator is placed outside the microcapsules, and a layer containing microcapsules containing an electron-donating colorless dye is coated. It is a recording medium that

To carry out color recording using these photosensitive recording media, basically, it is sufficient to use a recording medium having a plurality of photosensitive layers having different photosensitive wavelengths and coloring hues.

As an example of a more preferable multicolor recording medium, Japanese Patent Application No. 12249
30 and Japanese Patent Application No. 2-19710. For example, it has a plurality of photosensitive layers that are sensitive to light of different wavelengths and develop colors of different hues, and has a layer structure from the exposure light source side to the support side of the recording medium. 1 photosensitive layer, an intermediate layer that absorbs light with a center wavelength λ1, a second photosensitive layer that is sensitive to light with a center wavelength λ2 and develops a color different from that of the first photosensitive layer;
... An intermediate layer that absorbs light with a center wavelength λi-1, a first layer, a second layer, ... and an eleventh layer that are sensitive to light with a center wavelength λi.
At least two or more photosensitive layers are laminated on a support in the order of the first photosensitive layer that develops a color different from the second photosensitive layer, and the center wavelength is λ1, λ2, ..., λj. A multicolor recording medium that is characterized by this can be mentioned.

Here, Wataru is an integer of 2 or more.

Since this optical recording medium is a monosheet type, the center wavelength λ
When j is set in the visible range, the recording medium absorbs visible light, and the entire surface of the recording medium is colored. For this reason, it is desirable that the center wavelength be in the ultraviolet region.

That is, in the case of a color optical recording medium having cyan, magenta, and yellow coloring layers, it is desirable to have three types of center wavelengths in the ultraviolet region.

In other words, broadly speaking, the lower limit is 330 nm, which is the short-wave limit of light that can be transmitted through the presser glass of the exposure device and the Lith original.
It is preferable to have three types of center wavelengths in a region with an upper limit of 430 nm at which coloration of the recording medium is acceptable, that is, in a region of about 1100 nm.

However, according to common knowledge in the art, it is difficult to divide this narrow area into three. In particular, it is difficult to obtain monochromatic light source light that exposes only each coloring layer.

If you use a filter to divide a monochromatic light source into three parts, an undesirable phenomenon called crosstalk will occur. That is, for example, when imagewise exposing a region of λ2, the λ1 and/or λ3 component light of the light source light that has passed through the filter exposes areas other than the λ2 photosensitive layer, and therefore,
When the photosensitive recording medium prepared in this manner is developed, an image with a color different from that expected from the original is obtained.

``Problems to be Solved by the Invention'' The purpose of the present invention is to provide an image forming method using a completely dry black and white or color optical recording medium that does not generate unnecessary waste and does not require the use of a developer or the like; Furthermore, it is an object of the present invention to provide an image forming method capable of obtaining a clear image without color mixing between colors in a short time, and an exposure device suitable for use therein. It is.

"Means for Solving the Problems" An object of the present invention is to provide an exposure apparatus for exposing an image original by overlapping it on a photosensitive recording medium, characterized in that a vapor-deposited film filter is installed between a light source and the image original. A heat-developable photosensitive recording device in which a latent image is formed on a photocurable composition by exposure to light, and components involved in color development or decolorization are moved within the sensitive material according to the latent image by heating to form a color image. This is achieved by an image forming method characterized by using a medium, overlaying an image original on the photosensitive recording medium, and performing image exposure using an n-light device in which a vapor-deposited film filter is installed between a light source and the image original. Ta.

Examples of vapor-deposited film filters that can be preferably used in the present invention include metal interference filters such as the MTF-W type filter (manufactured by Japan Vacuum Optical Co., Ltd.), and full-layer electric interference filters such as the DIF type filter (Japan Vacuum Optical Co., Ltd.). (manufactured by Nippon Vacuum Optical Co., Ltd.), and guichroic filters (manufactured by Japan Vacuum Optical Co., Ltd.), and these can be used alone or in combination.

Further, the shape of the filter may also be various, such as a plate, a disc, a cylinder, or a hemisphere. In particular, in the case of an interference filter, since the cutoff wavelength changes depending on the angle formed between the transmitted light beam and the filter surface, it is preferable to have a function to correct this wavelength shift. For example, when a point light source is used, it is preferable to use a hemispherical shape or an interference filter having a curved surface that corrects the wavelength shift due to the angle with the transmitted light beam. Alternatively, an interference filter may be used in which this wavelength shift is corrected by changing the thickness of the deposited film.

This vapor-deposited film filter may be combined with a film filter containing a known dye or a colored glass filter (or a part of the vapor-deposited film filter may be replaced with this filter).

Examples of film-like filters containing dyes that can be used as dye filters include the 5C41 filter (manufactured by Fuji Photo Film Co., Ltd.), and examples of glass filters containing dyes include the L-42 filter (manufactured by Toshiba Glass Co., Ltd.). (manufactured by).

For color exposure, especially for long wavelength layer exposure, λl and λ
A sharp-cut filter such as 5C41 filter (manufactured by Fuji Photo Film Co., Ltd.) is used to cut light in the shortwave region called 2, and a band-pass filter such as a metal interference filter (manufactured by Japan Vacuum Optical Co., Ltd.) is used for medium-wavelength exposure. Things are good.

Further, in the exposure apparatus of the present invention, it is preferable to use a material with high transmittance in the ultraviolet region as the holding glass in order to facilitate wavelength fractionation, and in particular, in the ultraviolet region, it is preferable to use a material with high transmittance in the ultraviolet region.
Oxide glass with a transmittance of 60% or more in the wavelength range, such as quartz glass, Pyrex glass (manufactured by Dow Corning, xwAKI C0DE 7740 glass (manufactured by Iwaki Glass Co., Ltd.), DURAN GLASS
(It is preferable to use materials such as SCHOTTC 07 Hario 32 glass (manufactured by Shibata Scientific Instruments Co., Ltd.), Minigeum glass (manufactured by Asahi Glass Co., Ltd.), polyester film, etc., but blue plate glass etc. may also be used. .

In the image forming method of the present invention, a latent image is formed on the image original and the photocurable composition through exposure, and upon heating, components involved in color development or decolorization move within the photosensitive material according to the latent image, thereby causing the color to change. A heat-developable photosensitive recording medium on which an image is to be formed is stacked and exposed using an exposure device characterized by having a vapor-deposited film filter installed between a light source and the image original, and monomers are removed by a photopolymerization initiator in the exposed area. By polymerizing the recording medium and heating the exposed recording medium, components involved in color development or decolorization in the uncured portion are moved to form a visible image.

The photosensitive layer of the recording medium consists of, for example, an electron-donating colorless dye contained in binder microcapsules and droplets disposed outside the microcapsules. These droplets are composed of a photopolymerization initiator and a compound that has an electron-accepting moiety and a part of a polymerizable vinyl monomer in the same molecule. Photopolymerization of the accepting compound occurs. As a result, the electron-accepting compound is photocured and becomes immovable (so that even if this portion of the photosensitive layer is heated, the electron-accepting compound and the electron-donating colorless dye cannot come into contact with each other and no color develops).

On the other hand, in the unexposed area, the electron-accepting compound is thought to pass through the microcapsule wall when heated and come into contact with the electron-donating colorless dye, causing the electron-donating colorless dye to develop color and give a positive image. .

A recording medium having a negative photosensitive layer may also be used.

In the case of this negative recording medium, the photosensitive layer consists of an electron-donating colorless dye contained in binder microcapsules and droplets placed outside the microcapsules. These droplets are composed of a polymerizable vinyl monomer and a photopolymerization initiator, which have the property of erasing the color formed by the reaction between an electron-accepting compound and an electron-donating colorless dye. In some parts, the photopolymerization initiator causes photopolymerization of the color erasable vinyl monomer and it becomes immobile.

Upon heating, the electron-accepting compound and the electron-donating colorless dye come into contact with each other in this portion of the photosensitive layer, thereby developing color. On the other hand, in the unexposed area, the color-erasable vinyl monomer passes through the microcapsule wall when heated, and the colored pigment is erased by contact between the electron-donating colorless dye and the electron-accepting compound, resulting in a negative image. It is considered to give.

There are a wide variety of recording media that can be advantageously exposed using the exposure apparatus of the present invention, including monochrome, two-color, functional color, and full-color recording media.

In a multicolor recording medium, a plurality of photosensitive layers each sensitive to different wavelengths and each developing a different hue are provided on the same support. When exposing the photosensitive layer, it is also possible to prepare a plurality of exposure devices each having a filter corresponding to each photosensitive wavelength and perform exposure sequentially. It is more preferable to prepare one exposure apparatus having a function of sequentially replacing the filters each time.

Hereinafter, a full-color recording medium that develops colors of cyan, magenta, and yellow will be described as an example of a photosensitive recording medium.

FIG. 5 is a schematic diagram of the configuration of the recording medium 78.

The λ3 photosensitive layer 112 is a photosensitive layer that is sensitive to light having a center wavelength of λ3. Similarly, the λ2 photosensitive layer 116 is a photosensitive layer sensitive to light having a center wavelength λ2, and the λ1 photosensitive layer 120 is a photosensitive layer sensitive to light having a center wavelength λl.

114 and 118 are filter layers that absorb light having center wavelengths λ2 and λ1, respectively.

Next, an outline of the process of recording a color image using such a recording medium 78 using the exposure apparatus according to the present invention will be explained based on FIGS. 2 and 5.

First, the light passes through the filter F1 that transmits light with the center wavelength λ1, passes through the glass 77 and the corresponding image original 18, reaches the photosensitive recording medium 78, and exposes the photosensitive layer. As a result, the λ1 photosensitive layer 120 is exposed. At this time, since light other than the center wavelength λ1 is cut by the filter F1, the λ2 photosensitive layer 116 and the λ3 photosensitive layer 112 are not exposed.

Next, the photosensitive recording medium 78 is exposed through the image original 18 by the light having the center wavelength λ2 that has passed through the filter F2. The λ1 photosensitive layer 120 is not sensitive to this light, and the λ2
Photosensitive layer 116 is exposed. At this time, since light other than the center wavelength λ2 is cut by the filter F2, λ3
Photosensitive layer 112 is not exposed.

Finally, the recording medium 78 is exposed through the image original 18 by the light having the center wavelength λ3 that has passed through the filter F3. The λ3 photosensitive layer 112 is exposed while the λ1 photosensitive layer 120 and the λ2 photosensitive layer 116 are not exposed to this light.

Through such exposure, the portion of each photosensitive layer exposed according to the image displayed in 18 undergoes photopolymerization of the polymerizable electron-accepting compound by the photopolymerization initiator, as described above, and thereby electrons are generated. The receptive compound is photocured and becomes immobile. Even if this portion of the photosensitive layer is heated, the electron-accepting compound and the electron-donating colorless dye cannot come into contact with each other, making it impossible to develop color.

On the other hand, in the unexposed area, when the electron-accepting compound is heated, it passes through the microcapsule wall, comes into contact with the electron-donating colorless dye, and is thought to color the electron-donating colorless dye, giving a positive image.

FIG. 7 shows a schematic diagram of a positive photosensitive layer. The layer consists of a binder 210, an electron-donating colorless dye 206 contained in microcapsules 204, and droplets 209 placed outside the microcapsules 204. The droplet 209 is
It consists of a compound 208 having an electron-accepting moiety and a part of a polymerizable vinyl monomer in the same molecule, and a photopolymerization initiator. In the exposed portion of the photosensitive medium, the photopolymerization initiator causes photopolymerization of the polymerizable electron-accepting compound 208, and as a result of the electron-accepting compound 208 being photocured and immobilized, this portion of the recording medium is heated. Electron-accepting compound 208
and the electron-donating colorless dye 206 cannot come into contact with each other, making it impossible to develop color. On the other hand, in the unexposed area, when the electron-accepting compound 208 is heated, it passes through the microcapsule wall, comes into contact with the electron-donating colorless dye 206, and is thought to cause the electron-donating colorless dye 206 to develop color and give a positive image. .

In this way, the λ3 photosensitive layer 112, λ2f? light layer 116
, λl photosensitive layer 120 develops each color component, and a full color image is obtained.

Further, instead of this recording medium that provides a positive image, the aforementioned negative recording medium may be used.

In the case of a negative photosensitive layer, as shown in the schematic diagram in FIG.
This droplet 309 has the property of erasing the pigment that is colored by the reaction between the electron-accepting compound 308, the electron-donating colorless dye 306, and the electron-accepting compound 308. Polymerizable vinyl monomer 3 having
11 and a photopolymerization initiator, photopolymerization of the decolorable vinyl monomer 311 occurs by the photopolymerization initiator in the exposed portion of the recording medium, and the vinyl monomer 31
1 can't move. When heated, this part of the recording medium forms an electron-accepting compound 308 and an electron-donating colorless dye 306.
When they come into contact with each other, the color develops. On the other hand, in the unexposed area, when heated, the color-erasing vinyl monomer 311 passes through the microcapsule wall, and the colorless electron-donating dye 306 and the electron-accepting compound 308 contact each other, causing the colored pigment to disappear. , is considered to give a negative image.

"Example" Hereinafter, an exposure apparatus and an image forming method according to the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited thereto.

Embodiment 1 FIG. 1 is a block diagram showing an example of the circuit configuration of an exposure apparatus.

The operation button 67 has the function of selecting each filter from the interference filter group 54 consisting of Fl-F2 and F3, and creating a vacuum between the glass plate 77 and the holding plate 79 to bring the sandwiched original 18 and photosensitive recording medium 78 into close contact. function, then
It has a function of turning on the light source 12 for a predetermined period of time to expose the photosensitive recording medium 78, and after completing the exposure, breaking the vacuum and simultaneously removing the selected filter from the top of the light source to complete a series of monochromatic exposure operations.

The operation display section 68 displays the selected filter type, each operation time, etc.

Various types of operation buttons can be provided as necessary. For example, the C button is for cyan image exposure, the M button is for magenta image exposure, the Y button is for yellow image exposure, the BK button is for BK image exposure for negative photosensitive recording media, and the F button is for BK image exposure for negative photosensitive recording media.
Various buttons can be provided, such as for exposure without a filter.

This operation button can store the selection of a filter for exposure, the evacuation time for close contact, the power supplied to the light source (intensity of the light source), etc.

The light source 12 is of a type that generates ultraviolet light including wavelengths λ1, λ2, and λ3 or visible light in a region close to ultraviolet light. When the recording medium 78 is exposed to this light, light of a desired wavelength is separated by a filter selected from the filter group 54. Note that three light sources may be provided to generate ultraviolet light or visible light of wavelengths λl, λ2, and λ3, respectively. As the light source 12, an ultra-high pressure mercury lamp, a high-pressure mercury lamp, a metal halide lamp, a semiconductor laser, a strobe (xenon lamp), a tungsten lamp, an argon laser, a helium cadmium laser, a fluorescent tube, etc. can be used. A mercury lamp is particularly preferable because it emits strong short-wave light. light source 1
2 is driven by a light source drive circuit 66 under the control of the control circuit 50.

There is no particular limitation on the position of the light source, and it may be placed above or below the photosensitive recording medium as long as the light source, filter, document, and photosensitive recording medium are arranged in this order.

The filter group 54 includes a film filter containing a dye, such as a 1fsc41 filter (manufactured by Fuji Photo Film Co., Ltd.), a glass filter containing a dye, such as an L-42 filter (manufactured by Toshiba Glass Co., Ltd.), and a metal interference filter. For example, MIF-W! ! ! (manufactured by Japan Vacuum Optics Co., Ltd.), dielectric interference filters, e.g. DIF
A filter (manufactured by Japan Vacuum Optics Co., Ltd.), a dichroic filter (manufactured by Japan Vacuum Optics Co., Ltd.), etc. can be used alone or in combination.

Further, the shape of the filter may also be various, such as a plate, a disc, a cylinder, or a hemisphere.

Example 2 As the glass 77 that holds the original and the photosensitive recording medium, the third
Museum glass (manufactured by Asahi Glass Co., Ltd.) whose transmission spectrum is shown in the figure was used, and the filter was the filter shown in Figure 4. Specifically, the F1 filter was a MIF-W type filter with a center wavelength of 328 nm (Japan Vacuum Optical Co., Ltd.). ), the center wavelength is 38 as an F2 filter.
A 3 nm MIF-W type filter (manufactured by Japan Vacuum Optical Co., Ltd.), a 5C41 filter (manufactured by Fuji Photo Film Co., Ltd.) was used as the F3 filter, and a positive photosensitive recording medium with the photosensitive characteristics shown in Figure 6 was used as the optical recording medium. , the light source 12 is a 6Kw AEL light source (manufactured by Fusion)
Three image exposures were carried out using the following. After exposure, 120℃5
A clear image without crosstalk was obtained by heat development for a few seconds.

"Effects of the Invention" As described above, by using the exposure apparatus and image forming method of the present invention, a black and white or full color image can be obtained in a short time by simple heat development without generating waste.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing an example of the circuit configuration of an exposure apparatus according to the present invention. FIG. 2 is a schematic diagram of the exposure apparatus of the present invention. FIG. 3 is a diagram showing the light transmission characteristics of glass that can be used in the exposure apparatus of the present invention. FIG. 4 is a diagram showing the light transmission characteristics of a filter that can be preferably used in the exposure apparatus of the present invention. FIG. 5 is a diagram showing an example of the layer structure of a photosensitive recording medium used in the image forming method of the present invention. FIG. 6 is a diagram showing the photosensitive characteristics of each photosensitive layer of the photosensitive recording medium of FIG. 5. FIG. 7 is a schematic diagram of a positive photosensitive layer. FIG. 8 is a schematic diagram of a negative photosensitive layer. 12... Light source 18... Document 50... Control circuit 54... Group of filters F1, F2, F3 66... Light source drive circuit 67... Operation button 68... Operation display section 76 ...Power supply 77, 78, 79, 80, 82, 83, ...Glass that holds the original and the recording medium, Recording medium, Holding plate for the original and the recording medium, Vacuum pump drive circuit, Light intensity detection section, - Filter drive mechanism... Support... Antihalation layer... λ3 Photosensitive layer... Layer that absorbs light at λ2... λ2 Photosensitive layer... Layer that absorbs light at λ1... λ Technology Photosensitive layer...Protective layer...Microcapsule...Electron-donating colorless dye...Compound that has an electron-accepting part and part of a polymerizable vinyl monomer in the same molecule...An electron-accepting part and A droplet consisting of a compound having a portion of a polymerizable vinyl monomer in the same molecule and a photopolymerization initiator...Binder...Microcapsule...Electron-donating colorless dye...Electron-accepting compound...Electron Droplets consisting of an accepting compound, a polymerizable vinyl monomer that has the property of erasing the color formed by the reaction between the electron accepting compound and the electron donating colorless dye, and a photopolymerization initiator...binder... A polymerizable vinyl monomer that has the property of erasing the color produced by the reaction between an electron-donating colorless dye and an electron-accepting compound.

Claims (1)

[Scope of Claims] 1) An exposure device that exposes an image original by overlapping it on a photosensitive recording medium, characterized in that a vapor-deposited film filter is installed between a light source and the image original. 2) The exposure apparatus according to claim 1, comprising a plurality of said vapor deposited film filters and a mechanism for exchanging said vapor deposited film filters for each of a plurality of exposures. 3) The exposure apparatus according to claim 1 or 2, wherein the vapor-deposited film filter is a vapor-deposited film filter having a function of correcting a shift in cutoff wavelength due to an incident angle of light to the filter. 4) A heat-developable photosensitive recording medium in which a latent image is formed on a photocurable composition by exposure to light, and components involved in color development or decolorization move within the sensitive material according to the latent image by heating to form a color image. 3. An image forming method comprising using the exposure apparatus according to claim 1), 2) or 3), in which an image original is superimposed on the photosensitive recording medium and imagewise exposed. 5) The image forming method according to claim 4, wherein the photosensitive recording medium is a multicolor recording medium that obtains a multicolor image by multiple exposures. 6) In claim 5), the photosensitive recording medium includes, from the exposure light source side toward the support side of the photosensitive recording medium, a first photosensitive layer that is sensitive to light with a center wavelength λ1, and a first photosensitive layer that absorbs light with a center wavelength λ1. a second photosensitive layer that is sensitive to light with a center wavelength λ2 and develops a color different from that of the first photosensitive layer;
at least two or more layers in the order of: an intermediate layer that absorbs light of 1; and a 1st photosensitive layer that is sensitive to light with a center wavelength λi and develops a color different from that of the 1st, 2nd, and An image forming method characterized in that the photosensitive layer has a layer structure laminated on a support, and the center wavelength λ1<λ2<...<λi. Here, i is an integer of 2 or more. 7) In claim 6), the center wavelength λ of the photosensitive recording medium
1. An image forming method characterized by a full color photosensitive recording medium in which λ2 and λ3 are 320 nm or more, λ1 and λ2 are less than 400 nm, and λ3 is 400 nm or more.