JPS6294852A - Photosensitive body and polychromatic image forming method - Google Patents

Abstract

PURPOSE:To form a polychromatic image having superior resolving power without making the distribution pitches of color separating members uniformly small by making the distribution pitch of color separating members A to which a toner whose color gives the maximum visibility sticks smaller than that of other color separating members C or by distributing the members C among the members A. CONSTITUTION:A photoconductive layer 2 an insulating layer 3 contg. a layer 3a of distributed B, G and R color separating filters as color separating members are formed on an electrically conductive member 1. The ratio of the total area of the G filter parts of the filter layer 3a to the total area of the B filter parts and that of the R filter parts is (0.7-2):1. The resulting photosensitive body is electrostatically charged with an electrostatic charger 5 in a uniform state and the exposure IR of a red image is carried out to vanish negative charges on the interface between the layers 2, 3 at the R filter parts. The exposure LB of a blue image is then carried out to form the potential pattern of an image having a complementary color to B on the surface of the layer 3 at the B filter parts. A yellow toner image is formed with a developing device 8Y. After the surface potential is made uniform with an electrostatic charger 9Y, uniform exposure with green light and development with a magenta toner are carried out to form a two-color toner image.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photoreceptor used in color copying machines and the like based on electrophotography, and a multicolor image forming method using the photoreceptor.

[Background of the invention]

Many types of multicolor image forming apparatuses using electrophotography have been proposed. These can generally be divided into the following categories. The first method involves sequentially repeating the formation of a color-separated electrostatic latent image on a single photoreceptor and its development, thereby overlapping colors on the photoreceptor, or transferring the toner image to a transfer material each time it is developed. The colors are superimposed on the transfer material. The second method uses a plurality of photoreceptors corresponding to the number of colors, forms toner images of different colors on each photoreceptor at the same time, and sequentially transfers them to a transfer material to obtain a multicolor image. The latter method is advantageous in terms of high speed because toner images of each color are formed simultaneously on each photoreceptor, but it requires multiple photoreceptors, exposure means, etc., making the device complex, large, and expensive. Due to the price, it is not practical. Furthermore, all of the multicolor image forming apparatuses described above have a major drawback in that it is difficult to align the images when overlapping colors, and color shift in images cannot be completely prevented.

In order to fundamentally solve these problems, the present inventors have previously invented a mounting device that can form a multicolor image on a photoreceptor by performing image exposure once.

The device uses a photoreceptor provided with an insulating layer including a conductive member, a photoconductive layer, and a filter distribution layer consisting of a distribution of a plurality of different types of filters, which are color separation function members. Performs color image formation.

That is, applying electrical charge and image exposure to the surface of the photoreceptor K
By forming an image based on the charge density at the interface between the insulating layer and the photoconductive layer, and uniformly exposing the image forming surface to light that passes through only one polarity of the filters of the plurality of types of filters. A potential pattern is formed on the filter portion of the photoreceptor, and the potential pattern is developed by a developing device containing toner of a specific color to form a monochrome toner image. Next, after smoothing the potential by charging, uniform exposure is performed using light that passes through a different filter part than the previous one, and development is performed using a plastic imaging device that stores toner of a different color than the previous one. A second color toner image is formed on the photoreceptor. Thereafter, potential smoothing, uniform exposure, and development are repeated as many times as necessary. As a result, toners of different colors adhere to each filter portion of the photoreceptor, forming a multicolor image (see % Application No. 59-83096). According to this multicolor image forming apparatus, only one image exposure is required, so there is no risk of color shift occurring.

However, in order for this multicolor image forming device to form images with excellent resolution, the distribution of multiple types of filters in the filter distribution layer, which is the color separation function member distribution layer of the photoreceptor, must be made at a fine distribution pitch. However, making this distribution pitch finer means that the photoreceptor is manufactured
In addition, it is technically quite difficult to ensure the stability of development for each filter portion. Therefore, there was a problem that the obtained image had insufficient resolution.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned problems in a multicolor image forming apparatus using a photoreceptor having a distribution layer of color separation function members. If the distribution consists of B, G, and H filters to which limagenta and cyan toners are attached, the human eye is more sensitive to magenta than to yellow and cyan, so the B, G, and H filters are This was done after coming up with the idea that by appropriately changing the distribution of the filters, it is possible to improve the visual resolution of multicolor images by taking advantage of the differences in sensitivity between colors, without having to make the distribution pitch of all filters finer. It is.

That is, the present invention provides a photoreceptor that can form a multicolor image with excellent resolution without uniformly finely distributing the color separation function members in the color separation function member distribution layer, and a photoreceptor using the photoreceptor. The present invention provides a method for forming multicolor images with excellent resolution.

[Structure of the invention]

The present invention provides a photoreceptor that has a distribution layer of a conductive member, a photoconductive layer, an insulating layer, and a color separation function member, and allows toners of different colors to be deposited on different color separation function member parts. The distribution pitch of the color separation function member to which the toner of the color with the highest visibility is attached is finer than the distribution pitch of other color separation function members, or the distribution pitch of the color separation function member to which the toner of the color with the highest visibility is attached is A photoreceptor characterized by having a distribution layer of a color separation function member in which other color separation function members are distributed in a scattered manner on a background, Uniform exposure of a specific light that produces a potential pattern on the color separation function member and development of the resulting potential pattern with the corresponding color toner are repeated by changing the determination light and color toner, thereby causing the potential pattern on the photoreceptor. The present invention provides a method for forming a multicolor image, which is characterized in that toner images of different colors are synthesized, thereby achieving the above object.

〔Example〕

The present invention will be explained below using illustrated examples.

FIGS. 1 to 4 are cross-sectional views schematically showing examples of the layer structure of the photoreceptor of the present invention, and FIGS. 5 to 14 are B and G, respectively, in which light guides are provided on the layers as color separation function members. ,
A partial plan view of the filter distribution layer showing an example of the distribution of R filters, FIG. 15 is a process diagram for explaining the multicolor image forming method of the present invention, and FIGS. 16 and 17 are respectively the multicolor image forming method of the present invention. FIG. 18 is a schematic partial sectional view showing an example of a developing device used in the copying mode shown in FIGS. 16 and 17.

In Figures 1 to 4, l is a conductive material formed of metal such as aluminum, iron, nickel, copper, or an alloy thereof into a cylindrical shape or an endless belt shape as required. Component 2 is a photoconductor such as sulfur, selenium, amorphous silicon or an alloy containing sulfur, selenium, tellurium, arsenic, antimony, etc., or an oxide of a metal such as zinc, aluminum, antimony, bismuth, cadmium, molybdenum, etc. , inorganic photoconductors such as iodides, sulfides, and selenides, or organic photoconductors such as vinylcarbazole, anthracenephthalocyanine, trinitrofluorenone, vinylcarbazole, polyvinylanthracene, and polyvinylpyrene, as well as polyethylene, polyester, and polypropylene. , an organic photoconductor dispersed in an insulating binder resin such as polystyrene, polyvinyl chloride, polyvinyl acetate, polycarbonate, acrylic resin, silicone resin, fluororesin, epoxy resin, etc., that is, a charge generation layer typified by an organic semiconductor. A photoconductive layer consisting of a functionally separated photoreceptor consisting of a charge transfer layer; 3 is a color separation functional member formed from various polymers, resins, etc. and colorants such as dyes and pigments; blue (B) and green; (G) is an insulating layer including a distribution layer 3a of a red (R) color separation filter. The insulating layer 3 of the photoreceptor 4 in FIG. 1 is formed by printing or other means on the photoconductive layer 2 with an insulating material such as resin colored with a coloring agent to form a color separation filter. The insulating layer 3 of the photoreceptor 4 in FIG. 2 is formed by forming a filter distribution layer 3a in a predetermined pattern on the surface of a transparent insulating layer formed by conventionally known means. The insulating layer 3 in the photoconductor 4 in FIG. 3 is formed by sandwiching a filter distribution layer 3a between transparent insulating layers, and the photoconductor 4 in FIG.
The insulating layer 3 has a filter distribution layer 3 on the photoconductive layer 2 side.
a. A transparent insulating layer is formed on the outside. These filter distribution layers 3a are formed by printing, vapor deposition, photoresist, or other means.

To form the insulation Wj3, first form an insulating film or sheet including the filter distribution layer 3a, and then cover it with the photoconductive layer 2.
It may be attached or bonded by any suitable means.

Conventionally, the predetermined pattern of the filter distribution layer 3a is
For example, it is known that B, R, R filters are arranged regularly as shown in FIG.
It was said that it is preferable to set the period of the filter indicated by ' in the range of 50 to 500 μm.

However, it is quite difficult to create a filter with l and t' of about 100 μm or less, or to develop this filter portion faithfully. This problem can be solved by setting K so that a filter as large as possible can be provided without degrading the quality of the reproduced image.

Therefore, the present invention is characterized by employing a filter distribution configuration that emphasizes resolution in green light or magenta color by utilizing the difference in color sensitivity of human eyes. That is, in the present invention, the predetermined pattern of the filter distribution layer 3a is a distribution pattern in which BIG and R1 small filters are arranged such that the distribution pitch of the G filter is finer than the distribution pitch of the B and R filters, Alternatively, a distribution pattern is used in which B and R minute filters are scattered on the ground of the G filter, and the G filters are continuous with a minute width. Examples of the former distribution pattern are shown in FIGS. 6 to 9, and examples of the latter distribution pattern are shown in FIGS. 10 to 14.

If the filter distribution layer 3a is formed with the distribution pattern of IG + R7/ilta like this, and the yellow stripe center 9 cyan color toner is attached to the B, G, and R filter parts, respectively, l + l' Even if the arrangement pitch shown in is not particularly fine, the B, G, R The resolution of the color image obtained by combining three color toner images can be seen to be superior to that of the distribution pattern shown in FIG. 5 in which the distribution pitch of the filters is equal.

However, even with the above-described distribution pattern, if the area of the G filter portion becomes too large than the areas of the B and R filter portions, the reproducibility of tone will be lost. Therefore, it is preferable that the ratio of the area of the G filter portion to the area of the B filter portion and the R filter portion is 5:1 or less, particularly 2:1 or less. If this ratio is 0.7:1 or more, distribution patterns as shown in FIGS. 6 to 14 can be easily formed. The distribution pattern in Figure 6 shows that the area ratio of the G, B, and R filter parts is 2.
:1:1, and the distribution pattern in Figures 7 to 9 is 1:1.
l:l. In the distribution patterns shown in FIGS. 10 to 14, the preferable area ratios described above can be obtained by appropriately narrowing the continuous width of the G filter. In addition, the size of lrl' is 50 to 500 μm, respectively.
It is preferable to set it as approximately.

The filter distribution pattern of the filter distribution layer 3a is not limited to the examples shown in FIGS. 6 to 14. For example, a distribution pattern similar to that shown in Figure 6 can be created with a dense array of triangles or hexagons, and it is also OK to use triangular shapes with diagonal lines dividing the B and R filters in Figures 10 and 11. , and a distribution pattern in which rhomboid shapes in the joined state are arranged in a staggered manner may be used.

Next, a method of forming a multicolor image using the photoreceptor as described above will be explained with reference to FIG. Although FIG. 15 shows an example in which an n-type semiconductor photoconductor such as cadmium sulfide is used for the photoconductive layer 2 of the photoreceptor, it is not possible to use a p-type semiconductor such as selenium. However, the basic process of forming a color image remains the same, only that the positive and negative signs of the charges in the following explanation are reversed. In FIG. 15, the same reference numerals as in FIGS. 1 to 14 indicate the same functional members.

FIG. 15 [1] shows a state in which the photoreceptor 4 is uniformly charged by the positive corona discharge of the charger 5, and the insulating layer 30
A positive charge is generated on the surface, and a corresponding negative charge is induced at the interface between the photoconductive layer 2 and the insulating layer 3. As a result, the surface of the photoreceptor 4 becomes uniform as shown in the graph of the potential E. indicates the potential of Note that if it is difficult to inject charges when charging the photoreceptor 4, uniform spraying of light may also be used.

FIG. 15 [2] shows a state in which image exposure has been performed on the above-mentioned charged surface by the image exposure device 6, and for example, changes in the charging state due to the red component of the image exposure or the irradiation of the red image exposure. It shows. Since the red image exposure process R passes through the R filter part of the insulating layer 3 and makes the part of the photoconductive layer 2 below it conductive, the interface between the photoconductive layer 2 and the insulating layer 3 is The negative charge of disappears. On the other hand, G.

Since the red image exposure process does not pass through the B filter portion, the negative charge of the photoconductive layer 2 remains in that portion. The same applies to other color components of the heat-retaining light. In this way, a latent image is formed on the interface between the insulating layer 3 and the photoconductive layer 2 due to the charge density corresponding to the color component of each filter. However, due to the action of the discharger 610 of the image exposure device 6, the surface of the photoreceptor is The potential becomes constant as seen in the graph of potential E. This is because the charge on the surface of the photoreceptor is distributed so as to be balanced with the charge on the boundary surface, and in this state it does not function as an electrostatic image.

FIG. 15 (3) shows a state in which the above-mentioned image exposure surface is uniformly exposed to blue light LB obtained by the light from the lamp 7B passing through the filter FB.The blue light LB is transmitted through the R, G filter. The portions of the B filter do not pass through, so there is no change in those portions, but the B filter portion passes through and makes the photoconductive layer 2 below it conductive, thereby reducing the light transmission in that portion to the charge at the upper and lower interfaces of layer 2. As a result, in the B filter portion, a potential pattern appears on the surface of the insulating layer 3 as shown in the graph, which gives a complementary color image of blue in the previous image exposure.

FIG. 15 [4] shows a state in which a potential pattern formed by uniform exposure with blue light LB is developed by a developing device 8Y containing negatively charged yellow toner TY. The yellow toner TY adheres only to the B filter portion where the potential has changed due to the uniform exposure process, and does not adhere to the R/G filter portion where the potential has not changed. As a result, a color-separated one-color yellow toner image is formed on the surface of the photoreceptor 4. Although the potential of the layered portion of the yellow toner TY in the B filter portion is somewhat lowered by development, the surface potential is not uniform as shown in the graph.

FIG. 15 [5] shows a state in which corona discharge is performed by the charger 9Y on the surface of the photoreceptor 4 on which a yellow toner image is formed. This discharge by the charger 9Y lowers the potential of the B filter portion to which the yellow toner TY is attached, and makes the surface potential uniform. The surface potential of the photoreceptor 4 is shown in a graph.

Subsequently, this yellow toner image is formed as shown in FIG.
5] uniform exposure is performed on the surface of the photoreceptor 4 with green light obtained from a lamp and a green filter. As a result, a potential pattern appears in the G filter portion, similar to that described in FIG. 15 [3]. When this potential pattern is uniformly imaged by a developing device containing magenta toner, the magenta toner adheres only to the G filter portion, as shown in Fig. 15.
4], a magenta toner image is formed. As a result, two-color toner images are formed on the photoreceptor.

Further, a corona discharge is applied to this image forming surface using a charger in the same manner as shown in FIG. 15 [5] to make the surface potential uniform.

Subsequently, the surface of the photoreceptor 4 on which the two-color toner images are formed is uniformly exposed to red light obtained by a lamp and a red filter. In this case, no potential pattern appears in the R filter portion, and no cyan toner image is formed even if developed by a developing device containing cyan toner. Therefore, in this case, a red toner image is formed by combining the yellow toner image and the magenta toner image.

As can be inferred from the above example, from the green component of imagewise exposure or green image exposure and the blue component of imagewise exposure or blue image exposure, a green toner image and a cyan toner image are produced by combining a cyan toner image and a yellow toner image, respectively. A blue toner image is formed by combining the image and the magenta toner image.

When the image exposure is full-color image exposure, a full-color image is formed by combining yellow, macenta, and cyan toner images.

As a result of the above, a clear color image without color shift or color smearing is formed on the photoreceptor 4, and this color 4-image has a high luminous efficiency in the G filter portion where the distribution pitch is relatively fine or continuous. Since it is formed by adhering the largest amount of magenta toner, it has excellent resolution.

The above multicolor image forming process is summarized in Table 1, with the source colors and reproduced colors corresponding to each other. In Table 1, the symbol "z2)" indicates that an image pattern of charge density is formed on the interface between the insulating layer 3 and the photoconductive layer 2 of the photoconductor, and the symbol [○J] indicates that an image-like potential pattern is formed on the surface of the photoconductor. The symbol "◎" indicates that a toner image is formed, the symbol "↓" indicates that the state in the upper column is maintained as it is, and a blank column indicates that no image exists. . Also, "-" in the attached toner column.
indicates that toner is not attached, Y, M.

C indicates that yellow toner, magenta toner, and cyan toner are attached, respectively.

As mentioned in the example of FIG. 15, a monochromatic image can also be formed using the steps shown in Table 1. However, the monochromatic image is formed by one type of toner attached to any one of the B, G, and R filter portions of the photoreceptor 4, or by toners of different colors attached to each of a plurality of filter portions. Compared to images formed by monochrome copies, the amount of toner adhesion is smaller, or in cases where a single color is expressed using toners of different colors, the reflectance of color toner is higher than that of black toner, so the image density is lower. is insufficient, and resolution also decreases. Therefore, when forming a monochromatic image, the surface of the photoreceptor 40 subjected to image exposure as shown in FIG. 15 [2] is exposed to the -sg light of the blue light as shown in FIG. 15 [3] and then the green light as shown in FIG. Do uniform exposure and then uniform exposure to red light?
Perform a uniform exposure of white light. Therefore, there is B on the surface of the photoreceptor 40.

A potential pattern is generated in each of the G and H filter portions. By developing this with an arbitrary developing device, for example, a developing device that stores black toner, a black toner image with a high image angle of 114 degrees and good resolution can be obtained. Note that uniform exposure can be performed using any two of blue light, green light, and red light, particularly two that include green light, and the effect of improving image density and resolution can be obtained.

Table 2 shows the steps for forming a monochromatic image with excellent image density and resolution. K in the attached toner column in Table 2 indicates that black toner is attached, and the other symbols are the same as in Table 1.

In the process in Table 2! ! Only a monochromatic image of the color of the toner stored in the developing device provided in A can be obtained.

Therefore, even if the development described in Fig. 15 [4] is performed and toner adheres, the surface potential of the photoreceptor in that area will not drop to the same potential as the other areas. hand,
The same electrostatic latent image on which the -t+U image has been formed can be further developed with another developing device, and toner of another color can be superimposed thereon. For example, a red toner image can be formed by printing an image with a yellow toner and then superimposing an image with a magenta toner.

Table 3 shows the process of forming a monochrome VMI image by this subtractive color mixture. In Table 3, the same symbols as in Table 1 indicate the same contents.

The copying machine shown in FIGS. 16 and 17 is a copying machine that performs the above steps to record a multicolor image or a monochrome image.

The copying machine shown in FIG. 16 forms a multicolor image in the following manner while the drum-shaped photoreceptor 4 as described in FIGS. 1 to 14 rotates once in the direction of the arrow. That is, a charger 5 using a corotron corona discharger charges the surface of the photoreceptor 4 to a uniform potential, and an image exposure device! ? The surface of the photoreceptor 4 is activated by a discharge device 61 using a scorotron discharge device that performs image exposure using reflected light from a source 474 of white radiation and performs alternating current or direct current corona discharge with the opposite sign to that of the charger 5. Make the potential uniform. Next, the image-exposed surface is uniformly irradiated with blue light LB obtained by the lamp 7B and the blue filter FB, whereby a potential pattern that provides a complementary color image of blue appears on the image-exposed surface. This is developed by the W image device 8Y that stores yellow toner. Subsequently, the surface potential of the photoreceptor 4 is made uniform by the action of a charger 9Y using a scorotron discharger that performs corona discharge similar to the i-dummy device 61.

Next is lamp 7G and green filter F. The green glow obtained by is uniformly irradiated to form a potential pattern that provides a complementary color image of green, and a developing device [8M that stores magenta toner] develops the magenta toner, forming a two-color toner image on the surface of the photoreceptor 4. Thereafter, similarly, discharge of the charger 9M similar to the charger 9Y, uniform irradiation of red light LR obtained by the lamp 7R and red filter FR, and development by the developing device 80 containing cyan toner are performed. Through the above steps, yellow p-magenta is printed on the photoreceptor 4. A color image is formed by combining three cyan toner images. Photoreceptor 4 on which this color image is formed
The surface of the inactive state Kfl! The black toner is passed through the developing device 8 containing the black toner without being developed, and is further charged or exposed by the transfer pretreatment device 10 using an exposure lamp and a corona discharger. The color image is easily transferred, and the paper feeding device 1 is placed at the position of the transfer device 12.
A color image is transferred by a transfer device 12 onto the recording paper P fed from the printer 1. The fog light lamp of the transfer pretreatment device 10 is preferably one that emits white light or red external light that easily passes through the toner layer and the filter layer.

The recording paper P onto which the color image has been transferred is separated from the photoreceptor 4 by the separator 13, and transferred to the fixing device 1 by the conveyance means 14.
5, where the color image is fixed, and then discharged outside the machine.

The cleaning device I6 removes residual toner from the surface of the photoreceptor 4 on which the color image has been transferred, and the photoreceptor 4 returns to a state where the next image formation can be performed again.

In this copying machine, a monochrome image is formed as follows.

That is, with the chargers 9Y and 9M inactive, charging by the charging IE device 5, discharging by the discharger 61, and image exposure are performed as in the case of multicolor image formation, and then the filter F
B is evacuated and uniform exposure with white light is performed using the lamp 7B. Due to this, a potential pattern appears on the surface of all the filter portions of the photoreceptor 4. Apply this to any developing device 8Y.
Developed in steps 8 to 8 and 2 to obtain a monochrome image with any toner. 1, development is continued using any two of the developing devices 8Y to 8c to obtain a monochromatic image by color mixture.

Thereafter, similarly to the case of multicolor image formation, the formed monochrome image is transferred to the recording paper PK and fixed.

In the copying machine shown in FIG. 17, one color toner image is formed in one rotation of the photoreceptor 4, and each color is blue.

Lamp emitting green-red light 7'B r 7'G + 7
'H performs uniform exposure, and the discharger 6 of the image exposure device 6
This copying machine differs from the copying machine shown in FIG. 16 in that the surface level of the photoreceptor 40 after development is leveled using the photosensitive member 1.

Similar to the copying machine shown in FIG. 16, this copying machine can also record clear multicolor images with no color shift and excellent resolution, and monochrome images with excellent image density and resolution.

For example, when forming a three-color image, the photoreceptor 4 is
After performing image exposure and making the surface potential uniform by the discharger 61, a lamp is placed on the surface. '
A uniform f4 beam of blue light is applied, and the potential pattern formed thereby is developed by the developing device 8Y to form a yellow toner image. Jin's toner image is in developing device 8M~8
, a pre-transfer charger 10, a transfer device 121, a separator 13. The cleaning device 16 and the charger 50 pass through without being affected.

When the surface of the photoreceptor 40 on which the toner image has been formed reaches the position of the discharger 61, it is subjected to corona discharge to make the potential uniform, and then uniformly exposed to green light from the lamp 7'G, the potential is made uniform. A pattern is formed.

This is developed by the developing device 8M to form a magenta toner image. In the same manner, formation of a potential pattern and development using Ihoso [80] are performed to obtain a three-color toner image. Recording monochromatic images with a uniform exposure lamp? 'B,,7'
G.? Other than what is done in all 'H's, it is the same as in the copying machine shown in Fig. 16.

In the copying machine shown in Fig. 17, the lamp? 'B,? 'G
.

? Of course, instead of 'H, a uniform exposure device consisting of a combination of a white light lamp and a switching filter may be used. In that case, the switching filter should include a filter that transmits white light, such as an ND filter, so that a monochrome image can be formed like a monochrome copying machine, or a filter that allows uniform exposure without passing through the filter. It is preferable to 1st
In both the copying machines shown in FIG. 6 and FIG. 17, when forming a three-color image, it is possible to obtain a three-color image that is almost unchanged even if the final light source is white light.

In the above description of the present invention, the color separation function member is the filter distribution layer 3a consisting of B, G, and H filter parts provided on the photoconductive M2, and yellow, magenta, and cyan are placed on each filter part. Although an example has been described in which toner adheres to form a multicolor image, the present invention is not limited to this. For example, the color separation function member may be the same filter distribution layer 3 as described above.
The same applies to those in which a is provided on the back side of the conductive member 1 (Japanese Patent Application No. 59-199547) and the one in which the photoconductive layer 2 is used as a color separation function member (Japanese Patent Application No. 59-201085). Apply it. In addition, after performing -order charging and secondary charging, image exposure and tertiary charging for smoothing are performed, and then uniform exposure to specific light and development with color toner are repeated in the same way as described above to create a multicolor image. The present invention can also be used in the formation method.

In addition, Figure 16 and Figure 1? Developing device 8 in the photographic machine shown in the figure
For Y to 8K, a developing device capable of carrying out a non-contact developing method as shown in FIG. 18 is preferably used.

The developing device shown in FIG. 18 includes a developing sleeve 81 and a magnet body 82 having N and S magnetic poles on the inner peripheral surface of the imaging sleeve 81.
At least one of them rotates, and the magnetic force of the magnet body 82 transports the developer attracted to the surface of the developing sleeve 81 from the developer reservoir 83 in the direction of the arrow. During the conveyance of the developer, the conveyance amount is regulated by the layer thickness regulating blade 84 to form a developer layer, and the developer layer is formed on the photoconductor 4 in the parent image area facing the visual image sleeve 810. Month 1 according to the potential pattern. %do. During use and image formation, a developing bias voltage is applied to the developing sleeve 81 by a bias power supply 80. Further, even when development is not performed as necessary, the developing sleeve 781 is used to prevent toner from transferring from the developing sleeve 81 to the photoreceptor 4 or from transferring the toner from the photoreceptor 4 to the frame image sleeve 81.
A bias voltage may be applied to. 85 is a cleaning blade that removes the developer layer that has passed through the developing area from the developing sleeve 81 and returns it to the developer reservoir 83; 86 is a stirring blade that agitates the developer in the developer reservoir 83 to make it uniform and triboelectrically charges the toner. A means 88 is a toner replenishing roller that replenishes toner from the toner hopper 87 to the developer reservoir 83.

The developer used in such a developing device may be a so-called one-component developer consisting only of toner, or a two-component developer consisting of toner and a magnetic carrier. For development, a method may be used in which a developer layer, that is, a magnetic plan, is directly rubbed on the surface of the photoreceptor, but especially after the second visual image, the developer layer is removed to avoid damage to the formed toner image. Development methods in which the layer does not come into contact with the photoreceptor surface, such as U.S. Pat.
No. 7446, Japanese Patent Application No. 58-238295, Japanese Patent Application No. 1983
It is preferable to use the methods described in the specifications of No.-238296. , an alternating electric field is formed in the developing area to perform development without contact between the static support and the developer layer.In this non-contact development, the gap between the developing sleeve and the surface of the photoreceptor is used for the development on the developing sleeve. The gap and layer thickness are set to be larger than the layer thickness of the agent layer (provided there is no potential difference between the two), and development is performed under various conditions as described above at this gap and layer thickness.

The color toner used for development is prepared using known techniques, consisting of known binding resins, organic and inorganic pigments, various chromatic and achromatic colorants such as dyes, and various magnetic additives that are normally used in toners. As a carrier, iron powder, ferrite powder, which are usually used for electrostatic images, magnetic materials such as those coated with resin or KM magnetic material dispersed in resin can be used. Various known carriers can be used, such as carriers.

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

Hereinafter, further specific examples of the present invention will be shown.

The photoreceptor 4 in the copying machine shown in FIG. 16 has the layer structure shown in FIG. Light guide 1 made of CdS with a thickness of 40 μm on the layer
1L layer and 8fI above it, as shown in Figure 6.
G.

It consists of a mosaic arrangement of R filter parts, each microfilter has a period 1 and l' of 200 μm, an insulating layer with a thickness of 20 μm, an outer diameter of 1801111, and a surface velocity of 80 degrees/SeC. It was supposed to rotate. A developing device having the structure shown in FIG. 18 was used for the visual devices 8Y, 8M, and 80.8K. The developing sleeve 81 is made of non-magnetic stainless steel, has an outer diameter of 20 mm, and has a surface speed of 140 mm during development.
Magnet 8 rotating in the direction of the arrow at m+11/sec
2 has 8 N and S magnetic poles, gives a maximum magnetic flux density of 800 G to the surface of the developing sleeve 81, and has a magnetic flux density of 600' when forming a w image.
Rotate in the direction of the arrow at rpm. The surface gap between the photoreceptor 4 and the developing sleeve 81 is set to be equal to 0.75 in each of the developing devices 8Y, 8M, and 80.8K, so that a developer layer with a thickness of Q, 5+II+a is formed on the developing sleeve 81. did. The developer has an average particle size of 5 μm and -1θ to -20 μC/
A toner that is triboelectrically charged and a carrier made of a resin containing a dispersed magnetic material having an average particle size of 25 μm and a resistivity of 10 9 cm or more were mixed at a weight ratio of 1:9. Of course, the color of the toner is different from yellow-magenta, yellow, and black in each developing device 8Y, 8M, and 8 (3 and 8).Charger 5
A corotron discharger was used for the discharger 61 and chargers 9Y and 9M.

Then, the surface potential of the photoreceptor 4 is set to 1.5 k in the charger 5.
A discharge voltage such as V was applied, and a discharge voltage was applied to the dischargers 61 and chargers 9Y and 9M to bring the surface potential to -200V. It's a trench, developing device 8.
When Y, 8M, and 80 each perform development, a DC voltage of -150V and an effective value of 1.5 kV is applied to the developing sleeve 81.
, an equalizing bias voltage consisting of a superimposition of AC voltages with a frequency of 2 kHz is applied, and when performing 75f development on the developing device 8, a DC voltage of -100cm, an effective value of 1.2 kV, and a frequency of 2 are applied to the developing sleeve 81. An image bias voltage consisting of a superposition of a kHz alternating voltage was applied.

During non-development, the rotation of the developing sleeve 81 was stopped and only a DC component (which may be grounded or floating) was applied as a developing bias.

When a three-color image and a black monochrome image were recorded under the above conditions as described with reference to FIG. 16, a clear three-color monochrome image was recorded without any color shift or color clutter. In the conventional three-color image, the B, c, and R filters have the arrangement distribution shown in FIG. The resolution was superior when compared to the three-color image obtained using the photoreceptor under the same conditions as in the above-mentioned example.

〔Effect of the invention〕

According to the present invention, it is possible to form a multicolor image with excellent resolution even if the distribution pitch of each color separation functional member in the color separation functional member distribution layer of the photoreceptor is not uniformly fine. It becomes easy to manufacture a photoreceptor having a color separation functional member for obtaining a multicolor image, and it becomes easy to record a multicolor image with excellent resolution.

[Brief explanation of drawings]

FIGS. 1 to 4 are cross-sectional views schematically showing examples of the layer structure of the photoreceptor of the present invention, and FIGS. 5 to 14 are B and G provided on the photoconductive layer as color separation function members, respectively. ,
A partial plan view of a filter distribution layer showing an example of R filter distribution,
FIG. 15 is a process diagram for explaining the multicolor image forming method of the present invention, and FIGS. 16 and 17 are schematic side views showing an example of a copying machine for carrying out the multicolor image forming method of the present invention, respectively.
FIG. 18 is a schematic partial sectional view showing an example of a developing device used in the copying machine shown in FIGS. 16 and 17. DESCRIPTION OF SYMBOLS 1... Conductive member, 2... Photoconductive layer, 3...
...Insulating layer, 3a...Filter layer, 4.
... Photoreceptor, 5... Charger, 6... Image exposure device, 61... Discharger, 7B, 7G17R
17'B,? 'C, 7'R... lamp, 8Y, 8M,
80.8K...Developing device, 9Y, 9M...Charging device, 11...Paper feeding device, P recording paper,
12...Transfer device, 13...Separator, 1
5...Fuser. Patent Applicant Konishi Rokusha Teikuna Co., Ltd. Agent Patent Attorney Takaharu Tamotsu - 1m Figure 2 Figure 4111 Figure 6 Figure 73 Figure 12 I! Figure 73 Figure 14 II Figure 16

Claims (3)

[Claims] (1) In a photoreceptor having a distribution layer of a conductive member, a photoconductive layer, an insulating layer, and a color separation function member, toners of different colors are deposited on different parts of the color separation function member. The distribution pitch of the color separation function member to which the toner of the color with the highest visibility adheres is finer than the distribution pitch of other color separation function members, or the color separation function member to which the toner of the color with the highest visibility adheres has a different pitch. 1. A photoreceptor comprising a distributed layer of color separation function members in which the color separation function members are distributed in a scattered manner. (2) The ratio of the total area of the color separation function member to which the toner of the color with the highest visibility adheres to the total area of each of the other color separation function members is in the range of 0.7:1 to 2.0:1. A photoreceptor according to claim 1. (3) It has a distribution layer of a conductive member, a photoconductive layer, an insulating layer, and a color separation function member, and the distribution pitch of the color separation function member portion to which the color toner with the highest visibility is attached is different from that of the distribution layer. Is it finer than the distribution pitch of the color separation functional component part?
Alternatively, a photoreceptor is used which is composed of a color separation function member distributed in such a manner that the color separation function member part to which the color toner with the highest visibility is attached is the base, and other color separation function member parts are distributed in a scattered manner. After charging the photoconductor and exposing the image to light,
Uniform exposure to a specific light that produces a potential pattern in a specific color separation functional member part and development of the resulting potential pattern with a corresponding color toner are repeated by changing the specific light and color toner, thereby exposing the material to light. A multicolor image forming method characterized by combining toner images of different colors on a body.