JPS6295546A - Electrophotographic sensitive body and its production and image forming method - Google Patents

Abstract

PURPOSE:To form a multi-color image having excellent resolving power by having a composite filter of high resistance constituted of a filter group including filters formed of ink contg. coloring agents and curable transparent resin. CONSTITUTION:A photosensitive layer 2 is provided on a conductive member 1 and a layer 3 contg. a required color separating filter, for example, composite filter consisting of the fine color separating filter group of R, G and B is superposed and disposed thereon. The conductive member 1 is formed by using a metal such as aluminum, iron, nickel or copper or the alloy thereof, etc., and forming the same to a suitable shape and construction such as cylindrical, endless belt and other shapes according to need. As a method for forming the image, the multi-colored image is obtd. by repeating the stage consisting in forming a primary latent image by just one time of image exposure, executing full-surface exposure by a three color sepn. method to form secondary latent images for each of the colors of the color separating filters constituting the composite filter, developing the same with the toners of corresponding colors and again making electrostatic charge. The multi-color image having excellent quality in thus reproduced.

Description

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

[Conventional technology]

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 (l17r) in which each color toner image is formed on an electrophotographic photoreceptor by image exposure and development according to each color separated light and is transferred to recording paper each time. Alternatively, for example, a device equipped with a plurality of photoreceptors corresponding to the number of separated colors is used, and each photoreceptor is exposed and developed for each color to form a toner image of each color, which is sequentially transferred to recording paper. There is a method and apparatus (the latter).

[Problem that the invention seeks to solve]

However, the former method has drawbacks such as the fact that it takes a long time to record an image because the photoreceptor (leaf) is rotated several times to form a toner image of each color, and it is difficult to increase the speed. In this case, multiple photoreceptors are used in parallel, which is advantageous in terms of speed, but since multiple photoreceptors are used, the device becomes larger and more expensive.Furthermore, both the former and the latter Since the transfer process is repeated repeatedly, there is a problem in that (1γ alignment U) of the image is difficult.

[Means to solve the problem]

The present invention has been made in view of the above-mentioned problems, and therefore preferably contains a coloring agent and a transparent resin preferably having a shape of 70 layers or more on the photosensitive layer, and is composed of a plurality of filter groups including a color separation filter. provides an electrophotographic photoreceptor having a layer containing a reward filter having a specific resistance of 109 Ωcm or more, more preferably +o13 Ωcm or more; do.

According to the photoreceptor having the above configuration, since the physical properties of the composite filter are deteriorated, the adhesion of the filter to the printing surface, the abrasion resistance of the filter, etc. are excellent, and the coloring agent in the printing ink is excellent. The negative influence on the photoconductive properties of the photosensitive layer due to Further, since the coloring agent in the filter is sufficiently protected by the binder resin, there is no color bleeding between the color filters, and the color filters are arranged minutely in a linear or mosaic pattern. Therefore, a multicolor image with excellent resolution can be formed on the photoreceptor.

Further, the present invention provides a photoreceptor having a high-resistance composite filter composed of multiple types of filters including a filter formed from an ink containing a colorant and a curable transparent resin.
To provide an image forming method comprising a step of performing image exposure, and a step of repeating a step of uniformly exposing with specific light to form a potential pattern on each corresponding filter portion and developing this with toner. .

According to this image forming method, it is possible to quickly and easily form a multicolor image with excellent color balance and no brownish shift, etc., with only one image exposure.

In the present invention, a 1M composite is formed by combining a plurality of filters in a linear form, preferably in a mosaic form, to which sufficient physical properties are imparted by the action of a desired amount of binder resin on a photosensitive layer having photosensitivity in at least the entire visible light range. An electrophotographic photoreceptor having a filter is 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.

Next, by exposing the entire surface to a specific light, in this case the same color as the color of the first color separation filter, only the photosensitive layer under the filter of that color has a surface potential of a strength or weakness corresponding to the intensity of the second latent image. That is, a secondary latent image having a potential pattern is formed. This secondary latent image is developed with a toner having a complementary color to the +'+;r filter. Thereafter, the process of recharging to smooth the surface potential, full exposure to specific light to form a potential pattern in the next decomposition filter section, and the phenomenon of toner having a complementary color relationship with that of the filter is repeated to expose the surface to light. A multicolor image is formed on the body. This multicolored image is l
1lli The images are superimposed and transferred onto the recording paper in 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 light body according to the present invention. A photosensitive layer 2 is provided on the conductive member 1, and a required color separation filter, for example, fine red (R), is provided on the photosensitive layer 2.
, green (G), and blue (B) color separation filters are arranged in an overlapping manner. The conductive member I may be made of metals such as aluminum, iron, nickel, copper, or alloys 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 includes a photoconductor made of sulfur, selenium, amorphous silicon, or an alloy of these with tellurium, arsenic, antimony, etc., or zinc, aluminum 2, acedamon,
Metal oxides such as bismuth, cadmium, molybdenum,
Inorganic photoconductors of iodide, sulfide, and selenide are vapor deposited and formed by dispersion coating in a binder resin. In addition, a number of leading electric substances such as vinyl carbazole, anthracenephthalocyanine, trinide [nofluorenone, polyvinyl carbazole, polyvinylanthracene, polyvinylpyrene, polycyclic gynon dye, bisazo dye, etc.] can be similarly deposited or coated after resin dispersion. be done. Examples of such binder resins include insulating and translucent resins such as polyethylene, polyester, polypropylene, polystyrene, polyvinyl chloride, polyvinyl acetate, polycarbonate, acrylic resin, silicone resin, fluororesin, and Evokin resin. . Further, a photoconductor of a functionally separated type having an electron 6:f generation layer and an electron 6:j transfer layer is used.

The layer 3 including the composite filter may be composed of only the composite filter 3a as shown in FIG. 1, for example, or as shown in FIG.
As shown in FIG. and a composite filter 3a and a protective layer 3c as shown in the first diagram.

The composite filter 3a is made of a suitable hardening resin selected from the same kind of resin as the binder resin of the photosensitive layer 2 described above, such as a heat or light hardening acrylic resin, a silicone resin, a polyamide resin, a melamine resin, and an isocyanate resin. It is formed by selecting a cinnamic acid resin that can be cured and made solvent insolubilized by post-treatment, and containing a resin of 70 wt 11% or more and a coloring agent of less than 30 wt %, preferably 2 wt 11% or more. . As such a coloring agent, for example, organic dyes and pigments such as copper phthalocyanine, methylene blue, Nyanine blue, and Victoria blue are used for blue filters. In addition, for green filters, for example, brilliant green, malachite green,
Machine dyeing pigments such as naphthol green, and for red filters include Tsukushin, Phenosafranin, and Rhodamine B.
1. Organic dyes and pigments such as naphtholled are used.

In order to form the layer 3 containing the composite filter 3a on the photosensitive layer 2, the colorant and the curable binder resin are mixed with an Fi organic solvent such as toluene, heinine, ethyl acetate, methylethyl methane, acetate, and the like. It is formed into a linear or mosaic shape by sequentially performing printing techniques such as offset, gravure, silk screen, letterpress, etc., or photoresist, and curing with light or heat using an ink obtained by dissolving the ink. By doing so, the next filter section can be installed without destroying the previous filter section with a solvent or mechanical force. When directly printing on the photosensitive layer 2 using such an ink, it is preferable that the photosensitive layer is cured with light or a thermosetting resin, and further subjected to L1 stop processing if necessary. When the photosensitive layer 2 is made of a thermoplastic resin or is made of an organic photoconductor, an intermediate layer 3b such as a solvent-resistant insulating film is provided, and the intermediate layer 3b.
It is best to print on the other side, and this printed side is further coated with a protective layer 3c.
If it is protected by , it will be even more advantageous in terms of mechanical strength.

Alternatively, instead of printing on the photosensitive layer, a method may be used in which the protective film 3c is printed in advance and the printed surface of the film is placed face down on the photosensitive layer 2 for viewing or lamination.

The shape and arrangement of the color separation filters forming the composite filter are not particularly limited, but are shown in FIG.
For example, when the photoreceptor is drum-shaped, it is possible to use a linear shape such as one in which the lines are perpendicular to the direction of rotation, a hand-shaped one, and the like.

However, usually +.
'I? The size of each filter is
Color repetition width (Q in Figure 2) is 30) and 50
It is preferable to set it to 0 tzm. If the size of the filter is too small, it will be affected by other adjacent color areas (-<), and if the width of one of the filters is equal to or smaller than the particle size of the toner particles, it will be difficult to create. Become. 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. 1A to C and FIGS. 2A to C both 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 (CI) to [8] show schematically the image forming process in a portion of a photoreceptor using an n-type semiconductor such as cadmium sulfide as the photosensitive layer. In the figure, 1 and 2 are a conductive member and a photosensitive layer, respectively, as in FIG. 1, and 3 is a high-resistance three-color (R).

G. R) A layer containing a 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 which gives a positive corona discharge to the entire surface by the band 71 The state shown in FIG. 3 [1] is reached.

Next, alternating current or negative discharge is applied by the band 7ri device 5 equipped with an exposure sleeve j, 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 the blue multicolor image, but
For ease of understanding, the image forming process will be explained using an example of a document containing only a red image.

FIG. 3 [2] shows the state of the portion subjected to image exposure (arrow Lr) from the red image. The red light Lr passes through the red color separation filter part 3R of the layer 3 and makes the photosensitive layer 2 below it conductive, so that most of the positive itt charge on the layer 3 is erased and the red light is absorbed into the photosensitive layer 2. The induced negative charges are erased, and the surface potential becomes close to zero potential.

On the other hand, since the green and blue separation filter section 30° 3B does 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. And the erased part piezoelectric? An electric charge corresponding to 1 is induced in the conductive member 1. In this charge arrangement, the surface potentials of the green and blue separation filter sections 3G and 3Bt are close to zero 7IX. However, by controlling the grid voltage as a five-scorotron charger, a uniform surface potential of, for example, -200V may be achieved. Therefore, although the composite filter has an inherent charge pattern as a primary latent image, a toner image cannot be formed because no surface potential difference occurs.

Next, only one type of decomposition filter of composite filter 3 is charged (1)
The entire surface is exposed to specific light that produces a γ pattern, for example, blue light (arrow LB) obtained by the light source 6 and the blue filter FB. In this case, part of the negative charge of the photosensitive layer 2 of the decomposition filter 3B that transmits the blue light LB and the conductive member 1
If the positive charges on the filter 3 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. surface? Ii
rank is given. By developing this with the 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 step is to There is still room for another toner to adhere during the development process.

Therefore, the surface of the layer 3 is recharged with alternating current or negative direct current, preferably with a negative corona discharge by a scorotron charger 8, to restore the surface potential to a flat state as shown in the lower graph of FIG. 3 [5].・Returning to Figure 3, it is better to make the surface potential equal to [2].

Next, by exposing the entire surface with green light (arrow LG) obtained by the light source 6 and the green filter FG, as shown in FIG.
6], the negative charges in the photosensitive layer 2 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 station 3. By developing this with the developing device 9 carrying the magenta toner 'r2' shown in FIG. 3 [7], a magenta toner image is obtained in the area 3G.

Next, after recharging (Fig. 3 [8]), the entire surface is exposed to red light obtained by the red filter F'R, but at this time no potential pattern is generated, and the phenomenon caused by the cyan toner'rC is Not done. 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 visually observed is visually observed on the recording paper.

The above explanation is based on the case where the original is a red image, but the same applies to cases where the original is a white, green, blue, yellow, magenta, cyan, or black image. Color reproduction is performed by the combination. FIG. 4 is a diagram illustrating the process of color reproduction when such originals of each color are used. The groove axis in FIG. 4 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 code r, ::, , + indicates primary latent image formation, the code “01
10 represents the process of forming a secondary latent image, and 10 represents the process of 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 addition, although an n-type semiconductor is used as the photoreceptor in the above-mentioned 1 Yumei, a photoreceptor using a p-type semiconductor such as selenium may also be used. In this case, the sign of the charge is simply reversed. Basically there is no difference. Of course, either p-type or p-type photoreceptor 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 protected by a desired In curable resin is provided on the photoreceptor layer. As an image forming method, a primary latent image is formed by a single image exposure, and then a secondary latent image is formed for each color of the color separation filters that make up the composite filter by performing full-surface exposure using a three-color separation method. Then, by repeating the process of developing with toner of the corresponding color and recharging, a multicolor image was obtained.

The layer containing the n:f R self-composite filter can be used as a -Natsuo filter alone, and also has a protective layer made of an insulating film.
The thickness of the layer containing the composite filter is usually 10
The thickness should be 1 to 100 μm, preferably 20 to 50 μm.

In addition, the composite filter contains 70% by weight or more of a curable resin for a binder as a binder, and 30% by weight or more of an organic solvent-soluble dye or pigment (1/1:42% by weight or more). )
Preferably, 5 to 500 ug of the first-place surface is contained. To improve the processability of the external filter, a plasticizer can be added, and to prevent the colorant from being destroyed by ultraviolet light, an ultraviolet absorber such as Tinuvin can be added.

The processing method for the composite filter is to make full use of printing techniques such as letterpress, lithography, intaglio, letterpress offset, intaglio offset, and silk screen printing, or photoresist technology using ink made by dissolving the resin and colorant in an organic solvent. It is preferable to do this by

11; As the photosensitive layer on which the composite filter described in j is arranged, any photosensitive layer that is normally used in electrophotography can be used. When using a photosensitive layer dispersed in a photosensitive layer, the following measures are required. That is, in order to close the countless irregularities and holes existing in the photosensitive layer and prevent deterioration of photoconductive properties due to the intrusion of filter ink,
A stop layer is provided on which the composite filter is printed.

Furthermore, a composite filter is printed on the protective layer in advance, and is adhered to the sealed area of the photosensitive layer with the printed side facing down. Further, as the resin constituting the photosensitive layer, for example, heat or photo-curable acrylic resin, silicone resin,
Polyamide resin, melamine resin, incunate resin,
It is preferable to use cinnamic acid resin or the like to make it insoluble in solvents.

Next, as a method of forming a multicolor image using a photoreceptor having a standing filter, the so-called NP method is used, rather than utilizing the electric charge induced during photodamage as described above.
When forming a secondary latent image by the subsequent full-surface exposure, recharging is required in order to eliminate the 1:filtration problem 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 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.

(Embodiment 1) FIG. 5 is a cross-sectional view of a main part of a multicolor image forming apparatus for photographing a multicolor original consisting of the three primary colors of blue, green, and red for one summer to explain this embodiment. 1o is the photoreceptor, II is the positive DC primary phase I
I device, 12 is a scorotron charger for negative DC corona discharge with a slit for image exposure r7, 13 [3 is a light source that has a blue filter Fil, emits blue light, and irradiates B, +4Y
is a developing device containing yellow toner. 15 is a scorotron charger for negative DC corona discharge, 16G is a light source that has a green filter FC and irradiates green light [, G, 17M
18 is a negative DC corona discharge scorotron charger; +91"t is a light source that has a red filter F'III and irradiates red light 1 and R; 2
0 is a developing device containing cyan toner. 1) is a recording paper, 21 is a transfer electrode, 22 is a separation electrode, 23 is a static eliminator for removing residual charges by exposing white light from the back of the electrode, and 24 is a cleaning blade for removing residual toner.

°Photoreceptor IO is 45 μm thick on aluminum base drum
After providing a thick cadmium sulfide resin photosensitive layer and sealing the photosensitive layer with a thermosetting acrylic resin to a thickness of approximately 0.5 μm, inks of the three primary colors shown in the table below were used to ink No. 2 II r (such as 2
0Jzn+thick mosaic composite filter CQ = to
11) was printed on a 20 μm thick Mylar film by a screen method and adhered onto the photosensitive layer to produce a photoreceptor.

In addition, 11 "1. The photosensitive layer contains 100 parts by weight of fluidized cadmium j, 40 parts by weight of thermosetting Noricon-modified acrylic resin,
It was formed by spray coating a photosensitive solution containing 100 mf2 of toluene.

077, the photoreceptor 10 was uniformly charged with a voltage of 11: by using a F electric appliance J1, and then AC charging was carried out using an AC
Image exposure from the three primary color originals of blue, green, and red at the same time 1. scan and expose. A primary latent image corresponding to the intensity of image exposure from the original is formed on the photoreceptor 10'2 for each color separation filter of the composite filter. Next, the blue filter FI
Full exposure with white light 1ff13r3 with +11
An electrostatic charge image corresponding to the second-order latent image is formed in the area of the blue separation filter, and this is developed into yellow by the yellow developer 14Y.

Next, the entire surface is exposed LG by a white light source 16G equipped with a trailing edge color filter FG which erases the electrostatic charge image remaining in the region of the blue separation filter 1111 by a negative scorotron charger 15, and magenta development is performed by a magenta developer 17M. do.

Next, after erasing the remaining electrostatic image on the negative scorotron band 11 using a device 18, the entire surface is exposed L R using a white light source 19fl equipped with a red filter FR, and the cyan developing device 2
Develop cyan at 0. In this way, multicolored toner acids corresponding to the original are formed on the photoreceptor, and are transferred to the recording paper P fed at the same timing by the action of the transfer NIu 21.
And separation 7′! After being separated by the action of the pole 22, it is fixed by a fixing device (not shown).

On the other hand, after the transfer, the photoreceptor 10 is neutralized by a static eliminator 23, and then the remaining toner is cleaned by the cleaning plates 1 and 24, and the photoreceptor 10 is prepared for the next image formation.

The phenomenon in the present invention is preferably carried out by a magnetic brush method, and the developer may be either a so-called l-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 directly rubbing with a magnetic plan 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 is recommended. 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. Patent No. 3,893,418, JP
Publication No. 5-18656, Japanese Patent Application No. 58-57446, Japanese Patent Application No. 58-238295, Japanese Patent Application No. 58-238
It is particularly preferred to use a method such as that described in each specification of No. 296. This method uses a one-component developer consisting only of non-magnetic toner, which can freely select the coloring, and a two-component developer containing non-magnetic toner to form an alternating electric field in the phenomenon area, thereby forming an electrostatic image support. It is preferable that development is carried out without contacting the developing agent layer. However, a developer using magnetic l-toner may be used.

The color toner used for this phenomenon is composed of a known binding resin commonly used in toners, various chromatic and achromatic colorants such as organic and inorganic pigments and dyes, and various magnetic additives. It is possible to use a toner for electrostatic imaging produced by a known technique, and as a carrier, iron powder, Ferai!, which is usually used for electrostatic imaging, can be used. - Various known carriers can be used, such as magnetic carriers such as magnetic carriers, resin-coated carriers, or magnetic carriers dispersed in grease.

In addition, the applicant filed the patent application No. 58-24966 earlier.
9 and No. 5g-240066 may be used.

(Example 2) Example 1 on a cadmium sulfide photosensitive layer with a thickness of 357z+n
In the same manner as above, a 5 μm thick (Q = 150 μm) composite filter was made of polyethylene terephthalate (20 μm thick),
11 and GJt filters were sequentially cured on a photoresist film using an ink using an ultraviolet curable resin as a matrix resin, and then formed. This filter was adhered to the photosensitive layer to form a photoreceptor IO. 3 in the same manner as in Example 1 using the photoreceptor IO.
When a primary color image was formed, a high quality image with no color shift was obtained.

The following explanations have all been made regarding embodiments of color copying machines that use so-called three-color separation filters and three primary color toners, but the embodiments of the present invention are not limited thereto, and can be applied to various multicolor images. It can be widely used in recording devices, color photo printers, etc.

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

None, "charging" as used in the present invention means that the surface potential obtained when charging becomes O, or the surface potential becomes 71! This includes cases where cargo is lost.

Furthermore, in the above explanation, the spectral characteristics of light for full-surface exposure are obtained using blue (B), green (G), and red (R) filters, but they may also be obtained by means other than filters. Its spectral properties are not limited to G, [3, and R. The key is to expose the entire surface to a specific light.
If the spectral characteristic is such that an electric pattern is formed only in a specific filter portion corresponding to specific light on the photoreceptor, then it is acceptable. Therefore, "multiple types of filters" as used in the present invention refers to The photoreceptor may have six layers consisting of a color separation filter (a filter that transmits light only in a specific wavelength range) and a portion without a filter (which may be transparent resin or air, etc.). The portion is regarded as a transparent filter and is included in the above-mentioned "multiple types of filters." In this case, the transparent filter is preferably manufactured using toner particles that do not contain a colorant.

〔Effect of the invention〕

As is clear from the above description, since the photoreceptor of the present invention has a composite filter with excellent wear resistance, moisture resistance, adhesiveness, electrical properties, etc., the filter may be subject to deterioration, deformation, color bleeding, etc. It is possible to obtain a photoreceptor for forming multicolor images that is stable and can withstand long-term use without the disadvantages of . Further, when an image is formed using such a 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 adjust the positioning of each color toner image during transfer, resulting in smaller, faster, and more reliable image forming apparatuses. can be measured.

[Brief explanation of drawings]

FIGS. 1A to 1C are cross-sectional views of the photoreceptor according to the present invention, FIGS. 2A to C are arrangement diagrams of the color separation filters constituting the alignment filter, and FIG. 3 explains the process of forming an image from a red original. FIG. 4 is a diagram illustrating the process of forming images from various colored originals, and FIG. 5 is a sectional view of a 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 7 .9.14Y, 17M, 20G...Developer 6, 131
3.16G, +9R...Full surface exposure device 21...Transfer electrode 22...Separation electrode 23...Static eliminator 12...Cleaning blade P... iL iA Paper applicant Konishiroku Photo Industry Co., Ltd. Bb Suzu [1] [4] Figure 3 [2] Street [3]

Claims (17)

[Claims] (1) An electrophotographic photoreceptor characterized by having a high-resistance composite filter composed of a filter group including a filter formed of an ink containing a colorant and a curable transparent resin. (2) The electrophotographic photoreceptor according to claim 1, wherein the composite filter contains 70% by weight or more of the resin. (3) The electrophotographic photoreceptor according to claim 1 or 2, wherein the layer containing the composite filter is composed only of the composite filter. (4) The electrophotographic photoreceptor according to claim 1 or 2, wherein the layer containing the composite filter is constituted by the composite filter and a protective layer. (5) The electrophotographic photoreceptor according to any one of claims 1 to 4, wherein the composite filter has a specific resistance of 10^9 Ωcm or more. (6) The thickness of the layer containing the composite filter is 10 to 1
The electrophotographic photoreceptor according to any one of claims 1 to 4, wherein the electrophotographic photoreceptor has a diameter of 00 μm. (7) Includes a step of printing in a linear or mosaic pattern using multiple types of ink including ink containing a colorant and a curable transparent resin in the medium, and by this process, multiple types of filters are printed on the photosensitive layer. A method for manufacturing an electrophotographic photoreceptor, the method comprising forming a high-resistance composite filter composed of a group of filters. (8) The method for manufacturing an electrophotographic photoreceptor according to claim 7, wherein the composite filter contains 70% by weight or more of the resin. (9) The method for manufacturing an electrophotographic photoreceptor according to claim 7 or 8, wherein the layer containing the composite filter is composed only of the filter. (10) The method for manufacturing an electrophotographic photoreceptor according to claim 7, wherein the layer containing the composite filter is composed of the filter and a protective layer. (11) The method for manufacturing an electrophotographic photoreceptor according to any of claims 7 to 10, wherein the layer containing the composite filter has a thickness of 10 to 100 μm. (12) Claims 7 to 11, wherein the composite filter is formed on a photosensitive layer that is sealed as necessary.
A method for manufacturing an electrophotographic photoreceptor as described in . (13) the composite filter is formed on the protective layer;
The electrophotographic photoreceptor according to claim 7, 8, 10 or 11, wherein the protective layer is overlaid on the optionally sealed photosensitive layer with the filter surface facing down. Production method. (14) A step of imagewise exposing a photoreceptor having a high-resistance composite filter composed of a plurality of filter groups including a filter formed from an ink containing a colorant and a curable transparent resin; 1. An image forming method comprising the steps of repeating the steps of forming a potential pattern on each corresponding filter portion by uniformly exposing it to light, and developing the potential pattern with toner. (15) The image forming method according to claim 14, wherein, in the repeating step, the same number of color toner images as the number of filters are superimposed on the photoreceptor. (16) The image forming method according to claim 14 or 15, wherein the composite filter contains 70% by weight or more of the resin. (17) Claim 14, wherein the composite filter is formed by a step of printing in a linear or mosaic pattern using a plurality of types of ink including an ink containing the colorant and the resin in a medium. The image forming method according to items 1 to 16.