JPS63173065A - Electrophotographic sensitive body and multicolor image forming method - Google Patents

Abstract

PURPOSE:To eliminate the need for an intermediate layer, etc., and to prevent decrease of transmitted light by coating a photosensitive resin into which pigments having a specific grain size distribution are dispersed on a base, thereby forming a color sepn. filter. CONSTITUTION:The photosensitive resin film into which the grain size distribution having 1mum grain size in weight average is dispersed is formed on the base of the photosensitive layer. After the photosensitive film is subjected to pattern exposing, the film is developed to form patterned and colored images. An electrophotographic sensitive body provided with the color sepn. filter formed by repeating said operations plural times at need to form the colored images of plural colors to the patterned shape is used. The color filter is thereby easily produced without requiring a protective film (transfer blocking film for dyes) as the intermediate layer to form the transparent colored images colored to 2 or >=3 kinds.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an electrophotographic photoreceptor for forming multicolor images using electrophotography and an image forming method using the photoreceptor, and Used in color image forming devices, color photographs, printers, etc.

[Prior Art] Conventionally, several methods and apparatuses have been proposed for forming multicolor images using electrophotography.

For example, there is a multicolor image forming method and apparatus (former) that performs image exposure and development according to each color separated light on an electrophotographic photoreceptor and transfers each color toner image to recording paper each time. A method and apparatus for forming a toner image of each color by exposing and developing each photoreceptor for each color using a device equipped with a plurality of photoreceptors corresponding to the number of photoreceptors, and sequentially transferring the images to recording paper ( The latter).

However, in the former case, the photoreceptor is rotated multiple times to form each color toner image, so it takes a long time to record the image.
There are drawbacks such as difficulty in increasing the speed. In the latter case, a plurality of photoreceptors are used in parallel, which is advantageous in terms of high speed, but the use of a plurality of photoreceptors makes the apparatus large and expensive. Furthermore, since transfer is repeated multiple times for both the former and the latter, there is a problem in that it is difficult to align the images.

The present inventors have proposed JP-A-81-185440, JP-A-59-187044, and JP-A-5 to improve these drawbacks.
No. 9-199547, etc., a composite filter layer arranged in a mosaic pattern with multiple types of microscopic filters of different colors is placed above the photosensitive layer (the side to which toner adheres during development) or below the photosensitive layer. We proposed an image forming method using a photoreceptor on the non-adhesive side.

In this method, image exposure is applied through a composite filter bonded to a photoreceptor, and then the entire surface is exposed to specific light, and the portion of the composite filter corresponding to the specific filter has a potential corresponding to the light transmitted through the filter. This process of forming an image, developing it using toner of a specific color, and smoothing it by recharging is repeated for each type of filter to form a multicolor image on the photoreceptor. It has the advantage of requiring only a few times and no need for alignment, making it possible to easily obtain high-quality multicolor images.

[Problems to be Solved by the Invention] An image forming method using a photoreceptor having a composite filter in which multiple types of minute filters are arranged in a mosaic pattern has many advantages as described above. When manufacturing filters, there remains an unresolved problem as to how to obtain highly accurate, uniform, and high-quality color mosaic patterns with a high manufacturing yield.

In other words, in a color separation filter consisting of a color mosaic pattern as described above, the color absorption layer for color separation is formed by a combination of multiple coloring materials, but the resin layer is mainly formed by combining multiple dyes. Organic filters dyed with predetermined spectral characteristics using a combination are used.

In addition, a mask for forming an open pattern of a predetermined shape is placed on a transparent photosensitive resin, exposed and developed to form a first resin layer, and this first resin layer is dyed with a desired dye. After forming the first transparent colored image and protecting the surface with a protective film,
It is known that a second resin layer is formed in the same manner and then a third resin layer is formed to produce a colored image, but in this case, a photosensitive resin layer is patterned into a predetermined shape for each color image flj. Moreover, it could not be manufactured without applying a transparent protective film to each color. Furthermore, the light resistance and heat resistance of the dye were limited, and a satisfactory product could not be obtained. In particular, the method described above causes variations in the thickness of the colored image, which is a major problem when used as a color separation filter for electrophotographic photoreceptors.

The object of the present invention is to solve the above-mentioned problems, and protect a transparent colored image that is colored in two or more types in the middle. The purpose of the present invention is to provide a method for manufacturing a color separation filter in a cylinder without requiring a dye migration blocking film. This provides a light-resistant and heat-resistant color separation filter.

A further object of the present invention is to provide a color separation filter that is easy to set various conditions such as film thickness and spectral characteristics to predetermined values, has less unevenness on the filter surface, and is easy to perform post-processing or post-processing. Another object of the present invention is to provide an electrophotographic photoreceptor having such a color separation filter, and further to provide a multicolor image forming method using the electrophotographic photoreceptor having the color separation filter described above.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned drawbacks, and includes a pigment having a particle size distribution such that the weight average particle size is 1 μm on a photosensitive layer support. After forming a dispersed photosensitive resin film and then exposing this photosensitive film to pattern light,
By using an electrophotographic photoreceptor that is equipped with a color separation filter that forms a colored image in the form of a pattern after development, and further repeats the above operation multiple times as necessary to form a colored image in a plurality of colors in the form of a pattern. I was able to achieve my goal. It has been found that the above object can be solved by an image forming method in which a multicolor image is formed on the photoreceptor by repeating charging and image exposure of the photoreceptor, then full-surface exposure with specific light, and development. .

Hereinafter, the manufacturing process of the color separation filter for an electrophotographic photoreceptor of the present invention will be explained in detail based on the drawings.

FIG. 1 shows an embodiment of a color separation filter according to the present invention. First, an example of the procedure for creating a color separation filter according to the present invention will be explained with reference to schematic cross-sectional views shown in FIGS. 1(a) to 1(d).

A photosensitive resin with good dyeability, such as polyvinyl alcohol, gelatin, or photosensitive polyimide, is applied onto the transparent substrate 1 to a uniform thickness by spin coating, spraying, roll coating, dipping, or the like. do. At this time, for example, if a red pigment is dispersed, a red layer of the first color can be formed by pattern exposure using a negative mask and development.

Similarly, a photosensitive resin containing a green pigment is applied to the exposed surface of the support other than the red layer, exposed and developed, and then a blue layer formed by dispersing a blue pigment is further applied and developed. A color image is obtained.

As the support for the color separation filter of the present invention, transparent supports such as soda lime glass, Pyrex glass, quartz glass, synthetic quartz plate, optical resin plate, and transparent resin film can be used.

Alternatively, it may be formed by directly coating the photosensitive layer of a transparent electrophotographic photoreceptor.

Each color pigment used in the present invention is a colored powder that is poorly soluble in organic solvents or water, and includes organic pigments and inorganic pigments. Examples of organic pigments include azo lake type, insoluble azo type, condensed azo type, phthalocyanine type, and quinacridone type. Inorganic pigments include Miloli blue, iron oxide, cobalt violet, manganese violet, ultramarine blue, Dark blue, cobalt blue, cerulean blue, emerald green, cobalt green, biriazine, etc. are used.

In the above pigment, 10 of the total pigment particles have a particle size of 1 μm or more.
(
It is preferable that the length is 1'. Particles with a particle size of 1 μm or less account for all pigment particles! If it exceeds 1%, it is not preferable because the light transmittance decreases due to light scattering.

At the same time, the pigment used in the present invention has a particle size of 0.01 to 0.
．． Particles of 7 μm, preferably 0.01 to 0.3 μm, account for at least 20 weight % of the total pigment grains, preferably at least 30 weight Fi 1%, and more preferably 50 tons M%. It is desirable that the particles have a particle size distribution as described above.

Examples of the photosensitive resin in which the pigment described in 1-1 is dispersed include polyvinyl alcohol, gelatin, polyimide, polyamideimide, polyesterimide, and other JP-B No. 55-101.
Pyromellitic anhydride disclosed in Publication No. 80 and 4
．． A polyimide obtained by dehydrating and ring-closing a condensate with 4°-diaminodiphenyl ether is used.

As shown in FIG. 1, a photosensitive resin 10 in which a red pigment is dispersed is coated on a transparent polyester support.
2 is formed, exposed to ultraviolet light using a predetermined pattern mask, the exposed areas are cured, and the non-exposed areas are dissolved and removed with a developer to form a relief image as shown in Figure 1(b). . Similarly, a photosensitive resin film containing a green pigment dispersed therein is applied to form a green pattern adjacent to the red pattern, and then a blue pattern is created using the same photosensitive resin containing a blue pigment. This produces a color separation filter, which is directly or indirectly attached to the surface of an electrophotographic photoreceptor to form a photoreceptor for multicolor image formation.

FIG. 2A is a sectional view showing the structure of an electrophotographic photoreceptor having the above color filter, that is, a color separation filter, formed according to the present invention, and is coated with a photosensitive resin containing a coloring material such as a pigment. 1 is a diagram showing the configuration of an electrophotographic photoreceptor used as a substrate. The photoreceptor according to the present invention is formed by providing a photoconductive layer 10 on a conductive substrate 11. By the above steps,
This figure shows an example of an electrophotographic photoreceptor obtained by forming red, green, and blue color layers 5. It is preferable to further provide a transparent insulating layer on this layer 1 to protect the surface.

Further, FIG. 2 13 shows another embodiment of an electrophotographic photoreceptor equipped with a color separation filter of the present invention. This shows the configuration of

When a transparent substrate such as a plastic film is used as the substrate for the coloring material as described in 1-1, the color layer formed on the substrate is coated with a color filter on the photosensitive surface of the electrophotographic photoreceptor. The electrophotographic photoreceptor of the present invention can be obtained by laminating and adhering.

Figure 2! 1, ■ is the transparent substrate marked with "-", and 5 is the first
It is the same color layer as in Figure (a), 9 is the adhesive layer, and the photosensitive layer lO
This is a layer that provides adhesion for adhering the color layer 5 to the .

According to the present invention, any known adhesion method can be used as the adhesion method described in -1-. There are two methods: temporarily adhering the decomposition filter and photoreceptor, placing them under negative pressure and applying atmospheric pressure, and adhering them by continuing to apply compressed air to the temporarily adhered material as described above. be.

In the above method of bonding through a laminator,
Adhesion is performed by applying an adhesive to a sheet-like photoreceptor, passing it through a laminator roller together with a color separation filter, and applying pressure and heat. Furthermore, in the latter method, that is, in the method of bonding by placing under negative pressure and then applying atmospheric pressure and blowing compressed air, bonding is performed through a layer of adhesive.

Regarding the adhesion direction in the above adhesion, the surface of the transparent substrate of the color separation filter may be adhered to the adhesive layer provided on the photoreceptor surface, or the surface of the color separation filter may be directly adhered. The adhesive used to bond the photoreceptor and color separation filter is not particularly limited, and various adhesives and pressure-sensitive adhesives can be used. Therefore, silicone oil (for example, Shin-Etsu Silicone K) is used to maintain adhesion.
F-96), silicone oil (for example, Shin-Etsu Silicone KR-101-10), etc. are particularly preferably used for purposes requiring adhesiveness.

Next, referring to the shape and arrangement of the color separation filter according to the present invention, the shape and arrangement of the color separation filter useful in the present invention are not particularly limited, but the shape and arrangement as shown in FIG. If the photoreceptor is in the form of a drum, for example, a linear shape may be used, such as one in which the lines are perpendicular to the direction of rotation, or one in which the lines are parallel to the direction of rotation.

However, usually a mosaic structure such as 1+ in Figure 3 is used, and the size of each filter is 30 to 500 as the color repetition width (1+, 1x in Figure 3).
If the size of the filter is too small, it will be susceptible to the influence of other adjacent color parts, and if the width of one of the filters is equal to or smaller than the particle size of the toner particles. It will also be difficult. Furthermore, if the size of the filter becomes too large, the resolution and color mixing properties of the image will decrease, resulting in deterioration of the image quality.

Note that FIGS. 2A and B1 and FIGS. 3A to C all show the case where so-called three-color separation filters of red, green, and +'t are provided. In the figure, R indicates red, G indicates green, and B indicates +'t filter, but the coloring of the color separation filter according to the present invention is not limited to these three colors, and may be changed as necessary. can form a filter layer of different colors.

As described above, the electrophotographic photoreceptor of the present invention has a photoconductive photosensitive layer provided on a conductive substrate.

The conductive substrate 1 may be made of metals such as aluminum, iron, nickel, copper, or alloys thereof, and may have an appropriate shape and structure as required, such as a cylindrical endless belt shape. The photosensitive layer IQ is made of a photoconductor such as sulfur, selenium, amorphous silicon or an alloy containing sulfur, selenium, tellurium, arsenic, antimony, etc., or an oxide of metal such as lead, lead, mercury, cadmium, molybdenum, etc. , iodide, sulfide,
Inorganic photoconductive substances such as selenide, azo type, diazo type,
It is formed by dispersing dyes and pigments such as trisazo and phthalocyanine, charge transport substances such as vinyl carbazole, trinitrofluorenone, polyvinyl carbazole, oxadiazole, hydracine compounds, stilbene derivatives, and styryl derivatives, and then applying the resin. Ru.

Such binder resins include polyethylene, polyester, polypropylene, polystyrene, polyvinyl chloride,
polyvinyl acetate, polycarbonate, acrylic resin,
Examples include insulating resins such as silicone resin, fluororesin, and epoxy resin.

A functionally separated photoconductor having a charge generation layer and a charge transfer layer is also used.

Honpu Cl Seth? According to this method, a photoreceptor is used, in which a plurality of color separation filters are arranged in a combination of fine lines or a mosaic on a photosensitive layer that has photosensitivity over the entire visible light range, and image exposure is first applied to each filter. A primary latent image corresponding to the decomposed image density is formed on the photosensitive layer at the bottom of the photosensitive layer, and then the entire photosensitive layer is exposed to a specific light (in the example, the same color as the filter), so that the photosensitive layer at the bottom of the filter of the color is formed. A second latent image is formed only on the photosensitive layer, and a potential pattern corresponding to the light intensity of the first latent image forming process is formed.

Then, it is developed with a color toner of a color corresponding to the color of the filter, preferably a color complementary to the color that passes through the filter.

Thereafter, recharging is performed to smooth the surface potential, and the entire surface is exposed to specific light to form a potential pattern in the next decomposition filter section.
A multicolor image is formed on the photoreceptor by repeating the first stage of development with toner having a complementary color relationship with that of the filter. This multicolor image is superimposed and transferred onto the recording paper in only one transfer.

Figures 4 [1] to [8] schematically show the image forming process in a portion of a photoreceptor using an n-type conductor such as cadmium sulfide as a photosensitive layer. 11 in the figure. As in FIG. 2, IO is a conductive member and a photosensitive layer, respectively, and 5 is the three high-resistance colors ([3,
G, R) are decomposition filters.

The graphs at the bottom of each figure in FIG. 4 show the potential on the surface of each part of the photoreceptor.

First, a positive charge is generated on the surface of the color separation filter 5 by applying a positive corona discharge to the entire surface by the charger 14, and a corresponding negative charge is induced at the interface between the photosensitive layer 10 and the filter 5, as shown in FIG. ).

Next, alternating current or negative discharge is applied by a charger 15 equipped with an exposure slit to erase the charges on the surface of the color separation filter 5 while exposing the image from the multicolor original.

In the photoreceptor of the present invention, red, green,
Image formation is performed by performing blue multicolor image exposure, but for the sake of clarity, the image formation process will be described using an original having only a red image as an example.

FIG. 4 [2] shows the state of the portion subjected to image exposure from the red image (arrow Lr). Since most of the positive charges on the filter 5 are erased, the negative charges induced in the photosensitive layer 10 are also erased, and the surface potential becomes close to zero potential.

On the other hand, since the green and blue separation filter sections 5G and 5B do not transmit the red light Lr, some of the positive charges on the filter 5 are erased, but the negative charges in the photosensitive layer 10 remain as they are. Further, charges corresponding to the partially erased positive charges are induced in the conductive substrate 11. In such a charge arrangement, the surface potential on the green and blue separation filter sections 5G and 5B is close to zero potential. However, the charger 15 may be used as a scorotron charger and the polarity may be reversed by controlling the grid voltage to obtain a uniform surface potential of, for example, -200V. Therefore, the filter has an internal charge pattern as a primary latent image. However, a toner image cannot be formed because no surface potential difference occurs.
Next, the entire surface is exposed to specific light that produces a potential pattern only in a part of the decomposition filter, for example, blue light (arrow LB) obtained by the light source 16 and the blue filter FB. In this case, the decomposition filter transmits the blue light LB. A part of the negative charges on the photosensitive layer 10 under the photosensitive layer 5B and the positive charges on the conductive substrate 11 are neutralized, and a positive and negative charge is formed between the portion of the decomposition filter 5B and the photosensitive layer 10 as shown in FIG. 4 [3]. The charges remain and a positive surface potential is applied to the color separation filter 5. By developing this with the developing device 17 carrying negative yellow toner TY as shown in FIG. 4 [4], a partial yellow toner image of the separation filter 5B is formed. In the area of the separation filter 5B where this yellow toner image was formed, the surface potential remains unsaturated by the toner, so as shown in the lower graph, a relatively high surface potential remains, and the next step is to There is still room for another toner to adhere during the development process.

Therefore, the surface of the filter 5 is recharged with alternating current or negative direct current.
Preferably, a negative corona discharge is applied by the scorotron charger 18 to restore the flat surface potential as shown in the lower graph of FIG. It is best to make them equal.

Next, by exposing the entire surface to green light (arrow LG) obtained by the light source 16 and the green filter FC, the negative charges in the photosensitive layer 10 and the conductive substrate 11 are removed as shown in FIG. The positive charges of are neutralized, and a high surface potential in the lower graph is obtained in the 5G region of the filter 5. The developing device 19 carrying the magenta toner TM shown in FIG. 4 [7]
A magenta toner image is obtained in the 5G region by recharging to the 0th order (Fig. 4 [8]), and then the entire surface is exposed to red light obtained by the red filter FR, but at this time the potential is No pattern occurs, cyan toner T
When the yellow toner image and the magenta toner image are transferred and fixed onto the recording paper, a red image in which yellow and magenta are superimposed is visually observed on the recording paper.

The above explanation is for the case where the original is a red image, but the three-color separation method and the additive color mixture method also apply when the original is a white, green, blue, yellow, magenta, or black image.
Color reproduction is performed by combining primary color toners. Fifth
The figure is a chart explaining the process of color reproduction when such originals of each color are used. In FIG. 5, the horizontal axis represents the color tone of the original, and the vertical axis represents the process at each stage leading to toner image formation when each color original is used.

The symbol "○" represents the formation of a piston image, the symbol "○J" represents the formation of a secondary latent image, and the symbol "no" represents the process at each stage of toner image formation. The symbol ``ban'' indicates that the state of Yu-sama is maintained as it is, and the middle gate indicates the part where no latent image is formed.

In the +iQ explanation, an n-type semiconductor is used as the photoreceptor, but a photoreceptor using a p9 semiconductor such as selenium may also be used. In this case, the basic There is no difference.

Of course, as long as the photoreceptor can be used as an n-type or a p-type, either type may be used.

As is clear from the description in 1-1 below, the photoreceptor according to the present invention is a photoreceptor in which an insulating color separation filter is provided on the photoreceptor layer, and furthermore, an image is formed using the photoreceptor. The method is to form a primary latent image with a single image exposure, then expose the entire surface using the three-color separation method to form a secondary latent image for each color of the color separation filter, and then develop with toner of the corresponding color. By repeating the steps of charging and recharging, a multicolor image is obtained.

As mentioned above, the charge induced in the photosensitive layer is utilized. For example, it is used in the NP method, but when a secondary latent image is formed by the second and subsequent full-surface exposures, recharging is required in order to eliminate the adverse effects caused by the residual of the first latent image.

This recharging is carried out by an alternating current or negative direct current discharge, preferably by a negative corona discharge with a scorotron charger.

Note that "charging" as used in the method of the present invention includes cases where the surface potential obtained when charging becomes 0 or the surface charge disappears.

Further, the present invention includes -order charging, secondary charging with a polarity substantially opposite to the secondary charging, recharging for smoothing the potential pattern after image exposure, whole surface exposure with specific light, and specific color toner. It can also be applied to an image forming method in which development is repeated (Japanese Patent Application No. 60-22952).

The development in the present invention is preferably carried out by a magnetic brush method, and the developer may be either a so-called one-component developer using non-magnetic toner or magnetic toner, or a so-called two-component developer containing a mixture of toner and a magnetic carrier such as iron powder. can be used. For development, a method of direct rubbing with a magnetic brush may be used, but in order to avoid damage to the formed toner image, especially after the second development, a developing method in which the developer layer does not come into contact with the photoreceptor surface, A developing method in which the gap between the developing sleeve and the photoreceptor is set larger than the thickness of the developer layer on the sleeve (provided there is no potential difference between the two), for example, U.S. Patent No. 3.89:1.418 191 ml
='F, special release! (It is particularly preferable to use the method described in the specifications of Japanese Patent Application No. 55-18656, Japanese Patent Application No. 58-57446, and Japanese Patent Application No. 58-238295. In this method, coloring can be done freely. Using a one-component developer consisting only of non-magnetic toner or a two-component developer containing non-magnetic toner, an alternating current electric field is formed in the development area, and development is performed without contact between the electrostatic image support and the developer layer. However, a developer using magnetic toner may also be used.

The color toner used for development consists of a known binder resin commonly used in toners, various chromatic colors such as organic and inorganic pigments and dyes, and various additive layers such as charge control agents.
A toner for developing electrostatic images prepared according to the known technique I can be used, and the carrier may be iron powder or ferrite powder, which is usually used for electrostatic images, or more preferably iron powder or ferrite coated with a resin. Various known carriers can be used, such as n'4 high-resistance magnetic carriers in which magnetic substances are dispersed in resin. Also, Japanese Patent Application No. 58-249669 and No. 58-2 previously filed by the applicant of the present invention
The developing methods described in each specification of No. 40066 may be used.

[Effects of the Invention] As is clear from the above, the electrophotographic photoreceptor according to the present invention has a color separation filter formed by applying a photosensitive resin film in which a pigment having a specific particle size distribution is dispersed. Since there is no need for a diffusion prevention film for the pigment in the color layer that has already been formed, there is no need for an intermediate layer, etc. Therefore, the color element of the filter according to the present invention is only the coloring material film. Therefore, no reduction in transmitted light occurs, and when formed in the electrophotographic photoreceptor of the present invention, there is no need for an intermediate layer or a resist mask, so that it has excellent heat resistance and light resistance. Further, since the resin film is formed parallel to the surface and has a uniform thickness, a photoreceptor having a color separation filter with uniform spectral characteristics can be obtained.

Therefore, when forming an image using the electrophotographic photoreceptor of the present invention having the color separation filter described above, after charging and image exposure, repeating the entire surface exposure with specific light and development will improve density unevenness, sharpness, color tone, etc. It was possible to obtain multicolor images with superior image quality compared to conventional photoreceptors.

EXAMPLES The present invention will be specifically explained below with reference to Examples, but the embodiments of the present invention are not limited thereto.

FIG. 6 is a sectional view of a main part of a multicolor image forming apparatus for copying a multicolor image using the photoreceptor described above obtained by the method according to the present invention. SD is a photosensitive drum in which the film photoreceptor 40 is mounted on a metal drum, 41 is a positive DC charger, 42 is a negative DC corona discharge scorotron charger having a slit for image exposure, and 43B is a scorotron charger for negative DC corona discharge. A light source having a blue filter FB and emitting blue light LB, 44
Y is a developing device containing yellow toner. 45 is a scorotron charger for negative DC corona discharge, 46G is a light source that has a green filter FG and emits green light LG, 47M
48 is a negative DC corona discharge scorotron charger; 49R is a light source having a red filter FR and emits red light LR; and 50 is a developing device containing cyan toner. P is a recording paper, 51 is a transfer electrode, 52 is a separation electrode, 53 is a static eliminator for removing residual charges that removes static electricity while exposing the tlfl to white light from the back surface, and 54 is a cleaning blade for removing residual toner.

First, the photoreceptor 40 having the above structure is uniformly positively charged by the charger 41, and then negatively charged by the scorotron charger 42, and at the same time, the image exposure from the three primary color originals of blue, green, and red is scanned. Expose. On the photoreceptor 40, a 6-order blue filter F is formed, in which a primary latent image corresponding to the intensity of image exposure from the original is formed for each color separation filter of the composite filter.
The entire surface is exposed LB by a white light source 43B equipped with B,
An electrostatic charge image corresponding to the bubble image is formed in the region of the blue separation filter, and this is developed into yellow by a yellow developing device 44Y.

Next, the entire surface is exposed LG by a white light source 46G equipped with a trailing edge color filter FC in which the electrostatic charge image remaining in the area of the blue separation filter is erased by a negative scorotron charger 45, and magenta is developed by a magenta developer 47M. .

Next, after erasing the remaining electrostatic charge image by the negative scorotron charger 48, the white light source 4 equipped with the red filter FR
Full-surface exposure LR is performed using 9R, and cyan development is performed using a cyan developer 50. In this way, a multicolor toner image corresponding to the original is formed on the photoreceptor, and then transferred to recording paper P fed at the same timing by the action of the transfer electrode 51, and separated by the action of the separation electrode 52. Thereafter, the toner image on the recording paper is fixed by a fixing device (not shown).

On the other hand, after the transfer, the photoreceptor 40 is neutralized by a static eliminator 53, and then residual toner is cleaned by a cleaning blade 54, and the photoreceptor 40 is prepared for the next image formation.

All of the above explanations have been made regarding embodiments of a color copying machine using three color separation filters and three primary color toners, but embodiments of the present invention are not limited thereto, and include various multicolor image recording devices, Can be widely used in color photo printers, etc.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a color separation filter constructed according to the manufacturing process of the color separation filter used in the present invention, and FIG.
FIG. 3 is a cross-sectional view showing the structure of an electrophotographic photoreceptor having the color separation filter described above.
FIG. 4 is a diagram illustrating the image forming process from colored originals, FIG. 5 is a diagram illustrating the image forming process from various colored originals, and FIG. 6 is a diagram illustrating the image forming process according to the present invention. 1 is a sectional view of main parts of a multicolor image forming apparatus using a photoreceptor. 5... Color layer 9... Adhesive layer 10... Photosensitive layer 11... Conductive substrate applicant Roku Konishi Photo Industry Co., Ltd. Figure 1 (1) Figure 4

Claims (1)

[Claims] 1) Particles having a weight average particle size of 1 μm on the photosensitive layer and the transparent support.
A photosensitive resin film is formed in which a pigment having a particle size distribution such as the above particles is dispersed, and then this photosensitive film is exposed to light in a pattern, and then developed to form a patterned colored image. An electrophotographic photoreceptor comprising a color separation filter in which a pattern of colored images of a plurality of colors is formed by repeating the above operation a plurality of times in accordance with the above. 2) After forming a photosensitive resin film in which a pigment having a particle size distribution having a weight average particle size of 1 μm is dispersed on a photosensitive layer support and then pattern-exposing this photosensitive film,
Using an electrophotographic photoreceptor equipped with a color separation filter, which is developed to form a colored image in the form of a pattern, and further repeats the above operation multiple times as necessary to form a colored image in a plurality of colors in the form of a pattern, After charging and image exposure to the body,
An image forming method in which a multicolor image is formed on the photoreceptor by repeating full-surface exposure with specific light and development.