JPS6361262A - Electrophotographic sensitive body and image forming method - Google Patents

Abstract

PURPOSE:To provide the titled photosensitive body which withstands long-period use and to permit stable formation of multi-color images by forming a layer contg. many pieces of colored image parts of color sepn. filters on a transparent substrate, cutting such substrate to the size of the layer and adhering the same to a photosensitive layer. CONSTITUTION:The photosensitive layer 2 is provided on the conductive member 1 and the layer contg. the composite filter consisting of color sepn. filters; for example, color sepn. filter groups of red, green and blue is superposed and disposed thereon. The layer 3 is constituted of; for example, the layer consisting of only the composite filter 3a, the layer formed with a sealing layer or insulating intermediate layer 3b between said filter and the layer 2, the layer sandwiching the filter 3a with the layer 3b and a protective layer 3c and the layer consisting of the filter 3a and the layer 3c. The composite filter is cut to the size of the layer 2 by a cutting mark and is stuck to the layer 2 by using an adhesive layer to form the photosensitive layer in the case of adhering such composite filter to the layer 2. The photosensitive body formed in such a manner has excellent wear resistance, moisture resistance, adhesiveness and electrical characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic photoreceptor and an image forming method, and particularly relates to a photoreceptor for forming a multicolor image and a method for forming a multicolor image used in electrophotography. be.

Conventional technology] Conventionally, when obtaining multicolor images using electrophotography,
Although many methods and devices used therefor have been proposed, they can generally be classified into the following types. Part 1
One method is to repeat latent image formation and development with color toner using a photoreceptor according to the number of separated colors, and then overlap the colors on the photoreceptor, or transfer the colors to a transfer material each time the development is performed. This is a method of layering. Another method uses a device that has multiple photoreceptors corresponding to the number of separated colors, and simultaneously exposes each photoreceptor with a light image of each color, and the latent image formed on each photoreceptor is colored. It is developed with toner, sequentially transferred onto a transfer material, and the colors are superimposed to obtain a multicolor image.

However, the first method described above has a major drawback in that it takes time to record an image, and it is extremely difficult to speed up the process, since the process of latent image formation and development must be repeated. In addition, the second method described above is advantageous in terms of high speed because it uses multiple photoreceptors in parallel, but it requires multiple photoreceptors, an optical system, a developing means, etc., making the device complicated. , large size, high price, and poor practicality. Furthermore, both of the above methods have the major drawback that it is difficult to align the image when image formation and transfer are repeated multiple times, and color shift of the image cannot be completely prevented.

In order to fundamentally solve these problems, the present inventor previously proposed a method of recording a multicolor image on a single photoreceptor through one image exposure. (Unexamined Japanese Patent Publication No. 60-225855, 61
-65262, 61-63856, patent application No. 60
-229524) This is as follows.

In other words, multiple color separation filters (each filter section substantially transmits only light in a specific wavelength range) are combined in a fine linear or mosaic pattern on a photosensitive layer that is sensitive to the entire visible light range. First, image exposure is applied to the entire surface of the photoreceptor, and charges are distributed in the photoconductive layer below each filter according to the resolved image density (hereinafter referred to as the primary latent image). ), then by exposing the entire surface to light transmitted through the first color separation filter, an electrostatic image (hereinafter referred to as the "first latent image") corresponding to the intensity of the first latent image formation process is formed only on the photoconductive layer under the filter. A secondary latent image (called a secondary latent image) is formed and developed with a color toner of a color corresponding to the type of filter, preferably a complementary color to the color that passes through the filter, and then uniformly charged. A multicolor image is formed on the photoreceptor by repeating the same whole-surface exposure, development, and recharging operations, and the multicolor image is recorded on the transfer material at once by -times of transfer.

However, it is difficult to make a perfect filter, and due to misalignment during filter formation, transparent areas (where no filter is formed) or opaque areas (where filters overlap) are created, resulting in faithful color separation potential. An image is not formed, and a potential pattern of only a specific filter portion is not formed due to the entire surface exposure. For this reason, the color image that is desired to be reproduced will be out of color balance. Furthermore, it is difficult to ideally produce a filter that is transparent only in a specific wavelength range. Furthermore, in order to prevent a decrease in the sensitivity of the photoreceptor, it is better for the spectral transmittance of the filter to be as high as possible, but if the spectral transmittance of the filter is increased, it will inevitably become transparent to other wavelengths of light. This will result in

Furthermore, in the above method, the entire surface of the photoreceptor is exposed to a specific light to release the charge on the photosensitive layer corresponding to a specific filter, but when considering this exposure, the light source for the entire surface exposure generally has a wavelength distribution; Furthermore, each filter has a slight translucency at wavelengths other than specific wavelengths. Therefore, the entire WJ exposure also releases a certain amount of charge in other filter sections. This means that potential patterns are generated in other filter sections as well. In conventional image formation using a photoreceptor having a transparent insulating layer such as the NP or KIP method, it is sufficient to provide a sufficient amount of exposure, but when using this method, it is not possible to provide a specific overall exposure without limit.

[Problem that the invention seeks to solve]

The structure of a photoreceptor is usually a photosensitive layer on a conductive substrate, followed by an insulating layer including a filter.

Unlike the conventional photoreceptor having a transparent insulating layer, the method of the present invention requires not only the insulating layer but also the individual filters to have high insulating properties so as not to be electrically conductive to each other in order to reflect color separation function information as potential. In addition, resistance is maintained high even after repeated use, and ozone resistance, corona resistance,
Must be resistant to high voltage.

In order to operate stably under various environmental conditions,
It is better to have moisture resistance, and in addition, in the electrophotographic process, not only charging but also development and cleaning steps are performed continuously, and the insulating layer including the filter has to be strong against abrasion and scratches during development and cleaning. must have.

When providing an insulating layer having a filter on the photosensitive layer, the filter material,! ! There are some difficulties and problems that are different from conventional filters, such as how they are used.

The present invention provides a convenient method for cutting this composite filter to the size of the photoreceptor.

[Means for solving problems]

The present invention was made in view of the above problem, and involves forming a layer containing colored image areas of a large number of color separation filters on a transparent support, and cutting the support into the size of the photosensitive layer. The above object can be achieved by an electrophotographic photoreceptor characterized in that the electrophotographic photoreceptor is adhesively provided on a photosensitive layer. In addition, when forming the colored image area of the color separation filter group, a cutting confirmation mark is placed near the cut part of the transparent support, making it possible to obtain an excellent electrophotographic photoreceptor. A layer containing a group of decomposition filters is formed, the support is cut to the size of the photosensitive layer, charged using an electrophotographic photoreceptor adhered on the photosensitive layer, and after imagewise exposure, it is exposed to specific light. This is an image forming method that includes steps of repeating full-surface exposure and development.

Furthermore, a plurality of types of filter groups including color separation filters are formed on the photosensitive layer. Preferably the specific resistance is 10@Ω
Provided are an electrophotographic photoreceptor having a layer containing a composite filter having a resistance of el1 or more, more preferably 101'Ωc111 or more, and an image forming method using the electrophotographic photoreceptor.

According to the photoreceptor having the above configuration, since the composite filter has excellent physical properties, the insulating layer including the filter has excellent spectral properties, electrical properties, ozone resistance, corona resistance, moisture resistance, abrasion resistance, etc. In addition to being excellent, the adverse effects of colorants, binders, etc. on the photoconductive properties of the photosensitive layer are also eliminated.

Further, in this filter, there is no color bleeding between the color filters, and the color filters are arranged densely in a linear or mosaic pattern. Therefore, a multicolor image with excellent resolution can be formed on the photoreceptor.

The present invention also includes a process of imagewise exposing a photoreceptor having a high-resistance composite filter made up of a plurality of types of filter groups including a filter, and a process of subjecting the photoreceptor to various types of exposure with specific light to expose the corresponding filter portions to each of the photoreceptors. An image forming method is provided which includes the steps of repeating the steps of forming a potential pattern and developing it with toner.

According to this image forming method, the power and
It is possible to quickly and easily form a multicolor image with excellent color balance and no brownish shift.

In the present invention, an electrophotographic photoreceptor is provided which has a composite filter in which a plurality of filters each having sufficient physical properties are combined in a linear form, preferably in a mosaic form, on a photosensitive layer that is sensitive to at least the entire visible light range. used. For example, to form a multicolor image using the photoreceptor, firstly, the entire surface is subjected to primary charging, secondary charging, and simultaneous image exposure, and the photosensitive layer below each filter is charged with a layer corresponding to the decomposed image density. Forms a primary latent image. These details are described in the patent publication cited above.

Furthermore, as described in Japanese Patent Application No. 60-229524 filed by the present applicant, the entire surface can be subjected to primary charging, secondary charging, and image exposure tertiary charging to form a secondary latent image in the same manner.

Next, by exposing the entire surface to specific light, a secondary latent image having a potential pattern only on the specific filter portion is formed, and this secondary latent image is developed with toner. Thereafter, a multicolor image is formed on the photoreceptor by repeating the steps of recharging to smooth the surface potential, full exposure to specific light to form a potential pattern in the next separation filter section, and development with toner. . These multicolor images are superimposed and transferred onto the recording paper in only one transfer.

Hereinafter, the photoreceptor used in the present invention, its manufacturing method, and image forming process will be explained with reference to FIGS. 1 to 3.

FIG. 1 schematically shows a cross section of a photoreceptor according to the present invention. A photosensitive layer 2 is provided on a conductive member 1, and a required color separation filter is applied thereon, such as fine red (R) and green (G).
, blue (B) color separation filters are arranged in an overlapping manner.

The conductive substrate 1 may be made of metal such as aluminum, iron, nickel, copper, or an alloy thereof, and may have an appropriate shape and structure as necessary, such as a cylindrical shape or an endless belt shape.

The photosensitive layer 2 is made of a photoconductor such as sulfur, selenium, amorphous silicon or an alloy containing sulfur, selenium, tellurium, arsenic, antimony, etc.; Inorganic photoconductive substances such as metal oxides, iodides, sulfides, and selenides, azo, disazo, triazo, and 7-thalocyanine dyes, pigments, vinyl carbazole, anthracene,
Charge transport substances such as trinitrofluorenone, oxanoazole, hydrazone compounds, stilbene derivatives, and styrene derivatives are used in polyethylene, polyester, phoriflohylene, polystyrene, polyvinyl mide, polyvinyl acetate, polycarbonate, acrylic resin, silicone resin, A type of material dispersed in an insulating binding resin such as a fluororesin or an epoxy resin is formed by a photosensitive layer separated into a charge generation layer and a charge transfer layer.

When forming a functionally separated photoconductive layer that is divided into a charge generation layer and a charge transfer layer using the charge generation substance or charge transfer substance described above, the structure is as follows: ■ Charge transfer from the conductive substrate side A layer having a charge generation layer thereon.

■ From the conductive substrate side, there is a charge generation layer, a charge transfer layer on top of that, and a charge generation layer on top of the charge generation layer.
This is the method described in No. 0-245178.

The latter case (2) is a case where a charge generation layer on the substrate side is used when forming a charge layer uniformly at the interface between the insulating layer and the photoconductor layer. That is, following charging, charges are generated and moved in the charge transfer layer by simultaneous or subsequent full-surface exposure.

The former ■ is charge transfer from the conductive substrate! ! ! This is the case of a material in which charge can be injected into the lJ layer by charging. In this case, the charge generation layer on the substrate side in (3) is omitted.

The wI3 including the composite filter is, for example, the one consisting only of the composite filter 3a as shown in @1 Figure A, left, Figure 1B.
The intermediate layer 3b made of a sealing layer or an insulating film is formed between the photosensitive layer 2 as shown in FIG.
It is composed of a composite filter 3a sandwiched between an intermediate layer 3b and a protective layer 3c as shown in the figure, and a composite filter 3a and a protective layer 3c as shown in PttJ1.

When adhering such a composite filter to the photosensitive layer 2,
It is preferable that the photosensitive layer is cured with a thermosetting resin, and if necessary, it is sealed with a solvent-resistant resin.

When the photosensitive layer 2 is made of a material that is susceptible to deterioration, or is made of a soluble resin or thermoplastic resin, or is made of an organic photoconductor, a transparent solvent-resistant insulating intermediate layer 3b is used.
It is preferable to provide 3b and place a filter layer on top of this 3b.

If this filter surface is further protected by a protective layer 3c, it will be even more advantageous in terms of mechanical strength.

In addition, the adhesion between the photosensitive layer and the filter is achieved by forming a protective film filter in advance, and superimposing the film on the photosensitive layer 2 with the printed side up or down, preferably down, and then adhering or laminating. I can do things. The film at this time is a flexible insulating transparent film, preferably having a thickness of 5 to 40 μm. Moreover, a protective layer may be further provided thereon.

Since the film is soft, a part of the filter is fixed to a 50 to 200 μl thick film or a hard substrate to prevent deformation when installing the filter.

Not all substrates used for ordinary color filters are applicable to the electrophotographic photoreceptor of the present invention.

For example, the following can be specifically used.

Examples include plastic plates, optical resin plates, gelatin, polyvinyl alcohol hydroxyethyl cellulose, methyl methacrylate, polyester, and butyral polyamide resin films, but the film protective layer in the present invention has high abrasion resistance, high It is required that the resistor satisfies the three requirements of being able to hold static charge and being transparent, and in particular, its resistance value is IW
101 to effectively retain heavy charges and prevent image blurring
It is necessary that there be Ωell1 or more.

Effective insulators that meet these requirements include polyester 04 resin-based Mylar, fluorine rJf resin-based Tear-One, polyethylene resin-based polyethylene, and other resins such as acrylic, silicone, polyamide, polyamine, isocyanate, and cinnamic acid. It is.

However, the thickness of the light-transmitting insulating layer is an important factor that affects the quality of the electrostatic image, especially the sensitivity and contrast, and the durability of the photosensitive plate. In order to repeatedly use the photosensitive plate for a long period of time, it is necessary that the thickness of the insulating layer including the filter is 10 to 50 μm.

On the other hand, it is desirable that the photosensitive layer has sensitivity in the entire visible region and that the thickness of the photosensitive layer is 20 to 100 .mu.m in order to produce sufficient sensitivity and potential contrast.

The composite filter of the present invention is previously described in detail in Japanese Patent Application No. 59-210307 filed by the present applicant. It is formed by printing in a striped or mosaic pattern using printing techniques such as offset, gravure, and letterpress. When cutting the photoreceptor to size for this printing, a cutting mark is placed at a convenient exit position.The shape of this mark is similar to a printing register mark that is often used in normal printing. But it's enough.

The shape and arrangement of the color separation filters constituting the composite filter are not particularly limited, but may be linear as shown in FIG. It is possible to use a parallel one or a parallel one.

However, normally a mosaic structure as shown in Figure 2B and C is used, and the size of each filter is (1+-b
) is preferably 20 to 500 μ-. If the filter size is too small, it will be easily influenced by adjacent color areas, and the width of one filter may be smaller than the particle size of the toner particles. It becomes difficult to create the same level of l,% if it is less than that. 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. In addition, the first
Figures A to C1 and Figure 2 A to C all show cases in which so-called three-color separation filters of red, green, and blue are provided.

In the figure, R indicates a red filter, G indicates a green filter, and B indicates a blue filter.

Next, the process of forming a multicolor image using the photoreceptor of the present invention will be explained. Figures 3 [1] to [8] schematically show the image forming process in a portion of a photoreceptor using an n-type semiconductor such as cadmium sulfide as a photosensitive layer.

In the figure, numerals 1 and 2 are a conductive member and a photosensitive layer, respectively, as in FIG. 1, and numeral 3 is a layer containing a high-resistance three-color (B, G, R) composite filter. Further, the graphs at the bottom of each figure in FIG. 3 show the potentials on the surface of each part of the photoreceptor.

First, a positive charge is generated on the surface of the layer 3 containing the composite filter that gives a positive corona discharge to the entire surface by the band i-type device 4, and a corresponding negative charge is induced on the interface between the photosensitive layer 2 and the layer 3 containing the filter. As a result, the state shown in FIG. 3 (1) is reached.

Next, alternating current or negative discharge is applied by a charger 5 equipped with an exposure slit to erase the charges on the surface of the composite filter 3 while exposing the image from the multicolor original.

In the photoreceptor of the present invention, red, green,
Image formation is performed by exposing a blue multicolor image, 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. 3 [2] shows the state of the portion subjected to image exposure from the red image (arrow Lr). The red light Lr passes through the red color separation filter section 3R of the layer 3 and makes the photosensitive layer M2 under it conductive, so that most of the positive charges on the layer 3 are erased and induced into the photosensitive layer 2. The negative charges are also erased, and the surface potential becomes close to zero potential.

On the other hand, since the green and blue separation filters 3G and 3B do not transmit the red light Lr, some of the positive charges on the layer 3 are erased, but the negative charges in the photosensitive layer 2 remain as they are.
In addition, charges corresponding to the partially erased positive charges are induced in the conductive group Mi1.

In such a charge arrangement, the surface potential on the green and blue separation filter sections 3G and 3B becomes close to zero potential. However, by using the charger 5 as a sufrotron charger and controlling the grid voltage, a uniform surface potential of, for example, -200V may be obtained. Therefore, although the composite filter has a charge dust pattern as a primary latent image,
A toner image cannot be formed because no surface potential difference occurs.

The entire surface is exposed to specific light that generates a potential pattern only in one type of color separation filter of the composite filter 3, for example, blue light (arrow LB) obtained by the light source 6 and the blue filter FB. In this case, a part of the negative charge of photosensitive /12 at the bottom of the decomposition filter 3B that transmits the blue light LB and the conductive member 1
The positive charges are neutralized, and positive and negative charges remain between the layer 3 corresponding to the part of the decomposition filter 3B and the photosensitive layer 2 as shown in FIG. A surface potential is given. By developing this with a developing device 7 carrying negative yellow toner Ty as shown in FIG. 3 [4], a partial yellow toner image of the separation filter 3B is formed. In the area of the separation filter 3B 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 The development process leaves room for additional toner to adhere.

Therefore, the surface of the layer 3 is recharged with alternating current or negative direct current, preferably with a negative corona discharge by a Suflotron charger 8, to restore the state of flat surface potential as shown in the lower graph of FIG. 3 [5]. Then, by making the surface potential equal to the surface potential in FIG. 3 [2] by 1°, the entire surface is exposed to green light (arrow LG) obtained by the light source 6 and the green filter FG.
6], the negative charges in the photosensitive NJ2 and the positive charges in the conductive member 1 are neutralized, and a high surface potential in the lower graph is obtained in the region 3G of the layer 3. This is shown in Figure 3 [7]
A magenta toner image is obtained in the 3G area by developing with the developing device 9 carrying the magenta toner TM.

Next, after recharging (FIG. 3 [8]), the entire surface is exposed to red light obtained by the red filter FR, but at this time no potential pattern is generated and development with cyan toner TC is not performed. When the yellow toner image and magenta toner image are thus transferred and fixed onto the recording paper, a red image in which yellow and magenta are visually superimposed is formed 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 three-color separation method can also be used when the original is a white, green, blue, yellow, magenta, cyan, or black image.
Color reproduction is performed by combining primary color toners. FIG. 4 is a diagram illustrating the process of color reproduction when using originals of various colors. In FIG. 4, the horizontal thin lines represent 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 [·, −, = J represents the formation of a primary latent image, the symbol “◯” represents the formation of a secondary latent image, and the symbol rOJ represents the process at each stage of toner image formation. Further, the symbol "↓" indicates that the state in the upper column is maintained as it is, and the blank column indicates a portion where no latent image is formed.

In the above description, an n-type semiconductor is used as the photoreceptor, but a photosensitive layer using a p-type semiconductor such as selenium may also be used. There is no change. Of course, as long as the photoreceptor can be used as an n-type or a p-type, either type may be used.

[For production]

As is clear from the above description, the photoreceptor of the present invention is a photoreceptor in which an insulating composite filter is provided on the photoreceptor layer, and furthermore, the photoreceptor can be used to form an image by only one image exposure. After forming a primary latent image, a secondary latent image is formed for each color printing of a color separation filter that also constitutes a composite filter by performing full-surface exposure using a three-color separation method, and developing it with toner of a corresponding color. A multicolor image is obtained by repeating the recharging process.

The layer containing the composite filter may be composed of a composite filter J1 or a layer made of an insulating film; J! The layer containing the composite filter usually has a thickness of 5 to 1
00 μm, preferably 10 to 50 μm.

As the photosensitive layer on which the composite filter is placed, any photosensitive layer that is normally used in electrophotography can be used, but for example, inorganic semiconductor particles such as zinc oxide or cadmium sulfide may be added to the resin. When using a dispersed photosensitive layer, the following measures are required. That is, in order to close the innumerable irregularities and holes present in the photosensitive layer and prevent deterioration of photoconductivity due to intrusion of filter ink, a sealing layer is provided, and a composite filter is provided thereon. Alternatively, the composite filter is formed by adhering to the sealed surface of the photosensitive layer with the film surface provided with the composite filter facing upward or downward.

Further, examples of the resins constituting the photosensitive layer (J(oil) or filler resin, or resins used for the protective layer include heat-curing or photocurable acrylic resin, silicon υ1 resin, polyamide resin, melamine 01 resin, isocyanate resin, It is preferable to use cinnamic acid resin or the like to make it insoluble in solvents.

Next, as a method for forming a multicolor image using the photoreceptor having the composite filter, for example, the NP method is used, which utilizes charges induced in the photosensitive layer as described above.
When forming a secondary latent image by the subsequent full-surface exposure, recharging is required to eliminate the adverse effects caused by the residual latent image from the first exposure.

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

〔Example〕

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

(Example-1) 20 μm thick on an aluminum substrate having a drum shape
was plated with nickel, and 60 μl of selenium/tellurium (tellurium concentration: 18.7) was vapor-deposited thereon. A coating of ultraviolet curable resin was applied thereto by spraying to a thickness of 2 μffl.

On top of this, a separately prepared composite filter (thickness 30 μm
) was cut to the size of the photoreceptor using cutting marks, and adhered using silicon face (Shin-Etsu Silicon KR-101) as an adhesive to produce a photoreceptor of type D in FIG. Using this photoreceptor drum, multicolor images were produced and good results were obtained.

(Example 2) A conductive layer containing conductive carbon was provided on a polyester film, a charge transfer layer and a charge generation layer were laminated in this order on top of the polyester film, and a separately prepared composite filter was then cut using cutting marks. , and adhered to produce a photoreceptor of type D shown in FIG.

Using this photoreceptor sheet, multicolor images were produced with good results.

The configuration of each layer used in this example is as follows.

Conductive substrate Conductive carbon 70% by weight (Acrylic resin also serves as charge injection layer 30%) Thickness
5 μ theory Charge transfer layer 2c Oxanoazole 50% vinyl hydrochloride copolymer 〃 a (fat thickness 30 μl Charge generation layer 2b Sosazo dye 50 weight 96 Oxanoazole 25〃 Vinyl hydrochloride copolymer 25 !JI fat thickness 2μ Theory (Example-3) A 45μIII thick cadmium sulfide resin photosensitive layer was provided on an aluminum base drum, a composite filter was directly provided on this photosensitive layer, and a transparent layer was provided on top of it. A good multicolor image was obtained using the C type photoreceptor prepared.

Regarding the image forming process of each embodiment described above, fj
Explain in a military manner using an SS diagram.

Using the photoreceptor 40 manufactured in Example 1, the photoreceptor 40 having the above configuration is first uniformly negatively charged by the charger 41 (positively charged when the photoreceptor of Example 2 is used), and then At the same time as applying positive charging to the Sufrotron charger 42, image exposure from the three primary color originals of blue, green, and red is scanned and exposed.

On the photoreceptor 40, a sixth-order blue light transmitting interference filter and a glass filter FB are provided, in which a primary latent image is formed by color-separating the original corresponding to the intensity of image exposure from the original for each color separation filter of the composite filter. The whole surface is exposed Lll by the white light source 43B, and an electrostatic charge image corresponding to the second latent yellow is formed in the area of the blue separation filter, and this is developed with yellow toner by the yellow developer 44Y.

Next, the electrostatic charge image remaining in the region of the blue separation filter (negative in the photoreceptor of Example 2) is removed by a positive Sufrotron charger 45, and an interference filter F that transmits color light at the trailing edge is removed.
The entire surface is exposed LG by a white light source 46G equipped with G,
Magenta toner is developed by the magenta developer 47M.

Next, after erasing the remaining rrp electric image (negative in the photoconductor of Example 2) by a positive Sufrotron charger 48, the entire surface is exposed L by a white light source 49R equipped with a red filter FR.
R is applied, and cyan toner development is performed using a cyan developing device 50.

In this way, a multicolor toner image corresponding to the original is formed on the photoreceptor, and is transferred onto the 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. The toner image on the recording paper is then fixed by a fixing device (not shown).

On the other hand, after the photoreceptor 40 has been transferred, the charge is removed by a charge remover 53, and then residual toner is removed by a cleaning blade 54, and the photoreceptor 40 is prepared for the next image formation.

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 a non-magnetic toner or a magnetic toner, or a so-called two-component developer using a mixture of toner and a magnetic carrier such as iron powder. can be used. For development, a method of direct M rubbing with a magnetic brush may be used, but especially after the second development, in order to avoid damage to the formed toner image, a developing method in which the developer layer does not come into contact with the photoreceptor surface is used. Therefore, the gap between the developing sleeve and the photoreceptor is set larger than the thickness of the developer layer on the sleeve (
However, if there is no potential difference between the two,
For example, U.S. Pat.
It is particularly preferable to use a method such as that described in each light lit of No. 96. In this method, a one-component developer consisting only of non-magnetic toner and a two-component developer containing non-magnetic toner are used, and an oscillating electric field is formed in the development area, and the electrostatic image support and developer are Preferably, the development is carried out without contacting the layers. However, a developer using magnetic toner may be used.

The color toner used for development consists of a known binding resin commonly used in toners, organic and inorganic pigments, various chromatic and achromatic colorants such as dyes, and various magnetic additions. A toner for developing a streetcar image made by a known technique can be used, and as a carrier, iron powder or ferrite powder, which are usually used for rrPTi images, a resin coating thereof, or a resin coated with a magnetic material dispersed in the resin can be used. Various known carriers can be used, such as magnetic carriers such as .

In addition, the applicant filed the patent application No. 58-24966 earlier.
No. 9, No. 58-240066 each! The developing method described in Book a may be used.

All of the above explanations have been about actual examples of color copying machines that use so-called three-color separation filters and three primary color toners.
The embodiments of the present invention are not limited thereto, and can be widely used in various multicolor image recording devices, color photographic printers, and the like.

It goes without saying that the combination of the color of the separation filter and the color of the toner corresponding thereto can be arbitrarily selected depending on the purpose.

〔Effect of the invention〕

As is clear from the above description, the electrophotographic photoreceptor of the present invention has a composite filter with excellent abrasion resistance, moisture resistance, adhesiveness, and electrical characteristics, so that it is free from harmful effects such as filter deterioration, deformation, and color bleeding. Therefore, it can be used as a photoreceptor for forming multicolor images that is stable and can withstand long-term use. Further, when an image is formed using such an electrophotographic photoreceptor, an extremely high quality multicolor image can be reproduced.

In addition, image exposure, which conventionally required multiple times, is now required only once, and there is no need to align each color toner image during transfer, allowing image forming devices to be more compact, faster, and more reliable. be able to.

[Brief explanation of drawings]

Figures 1A to 1 are cross-sectional views of the electrophotographic photoreceptor according to the present invention, Figures 12A to C1, 1 are arrangement diagrams of color separation filters that also constitute a composite filter, and Figure 3 is an image from a red original. Figure i4 is a diagram illustrating the forming process from various colored originals, and Figure 5 is a sectional view of the multicolor image forming apparatus illustrating an embodiment. 1... Conductive member 2... Photosensitive layer, 3... Layer containing a composite filter, 4.11... Positive corona charger, 5.12... AC charging/image exposure device, 10 ...Photoreceptor? , 9.14Y, 17M, 20C...Developer, G, 13B, 16G, 19R...Full surface exposure device, 21...Transfer electrode, 22...Separation electrode, 23...Static eliminator, 12 ... Cleaning blade, P ... Recording paper applicant Konishi Roku Photo Industry Co., Ltd. Figure 2 B

Claims (3)

[Claims] (1) A layer containing colored image areas of a large number of color separation filters is formed on a transparent support, the support is cut to the size of the photosensitive layer, and the layer is adhered onto the photosensitive layer. Characteristic electrophotographic photoreceptor. (2) The electrophotographic photoreceptor according to claim 1, wherein a cutting confirmation mark is placed near the cut portion of the transparent support when forming the colored image portion of the color separation filter group. (3) A layer containing a group of color separation filters is formed on a transparent support, the support is cut to the size of the photosensitive layer, and an electrophotographic photoreceptor is provided by adhering it on the photosensitive layer. An image forming method comprising the steps of repeating charging, imagewise exposure, whole-surface exposure with specific light, and development.