JPS62205374A - Color image forming device - Google Patents

Abstract

PURPOSE:To obtain an image developed with a specific color in a division area in an original surface by controlling entire-surface exposure and development on a photosensitive body with a color separating function according to area specification, etc. CONSTITUTION:The photosensitive body which is constituted by forming an insulating layer of respective color filters on a photoconductor and has the color separating function is exposed to an original image to form a charge density image at the boundary between the photoconductor and filters, etc., and a latent image is formed on filters by entire-surface exposure wherein light is transmitted through the specific color filters and developed with desired color toner. When an image is formed by forming an image repeatedly ad mentioned above, an area is specified on an input tablet 25 and a color is also specified through ba console panel 30, and then entire-surface exposing devices 7B, 7G, 7R, 7K, and 7W and color developing devices 8Y, 8M, 8C, and 8K, etc., are selected for respective areas through a CPU and images developed with specified colors are formed in respective decomposition area in the original surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color image forming apparatus, and particularly to a color image forming apparatus that forms images using electrophotography.

[Conventional technology]

Many multicolor image forming devices using electrophotography have been proposed in the past. These can generally be divided into the following categories. The first method is to sequentially repeat the formation and development of a color-separated electrostatic latent image on a single photoconductor, and to overlap the colors on the photoconductor, or to transfer the toner image to a transfer material each time it is developed. The colors are superimposed using a 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 alignment during color overlapping is difficult and color shift in images cannot be completely prevented.

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

The apparatus forms a multicolor image as follows using a photoreceptor provided with an electrically conductive member, a photoconductive layer, and an insulating layer including a filter layer consisting of a plurality of different types of filters. That is, by applying electrical charge and image exposure to the surface of the photoreceptor, an image is formed due to the charge density at the interface between the insulating layer and the photoconductive layer,
By exposing the entire surface of the image forming surface to light that passes through only one type of filter of the plurality of types of filters, a potential pattern is formed on that filter part of the photoreceptor, and the potential pattern is applied to a specific color. A monochromatic toner image is formed by a developing device containing toner. Next, in order to smooth the potential, the entire surface of the photoreceptor is exposed to light that passes through a filter part different from the front opening after charging, and development is performed using a developing device that stores toner of a different color than the previous one. A second color toner image is formed. Thereafter, the entire surface exposure and development are repeated as many times as necessary. As a result, toners of different colors are deposited on each filter portion of the photoreceptor, forming a multicolor image. (Special application 1984
-83096 and 59-187044). According to this multicolor image forming apparatus, only one image exposure is required, so there is no risk of color shift occurring.

In this multicolor image device, color reproduction is performed by a so-called additive color method in which colors are not superimposed at the same position in principle.

Therefore, in addition to solving the above-mentioned color shift problem, the fidelity of color reproduction is high.

[Problem that the invention seeks to solve]

However, conventional image forming apparatuses using electrophotography have a problem in that it is not possible to divide the surface of a document into a plurality of regions and develop an image in a designated color for each region.

The present inventor has the above-mentioned Japanese Patent Application No. 59-83096 and
-1, which retains the advantages of the invention according to No. 870114, and further enables the formation of an image in which the color of the original image is changed to a desired color, and solves the above-mentioned problems. By specifying areas and colors on the original, it is possible to obtain an image with multicolor trimming or erasing of specified areas using only one original, without having to create an original for each development color. The purpose is to provide a color image forming device.

[Means for solving problems]

1. The purpose of item 1 is to form an image by disposing a charging means, an image exposing means, an entire surface exposing means, and a developing means facing a photoreceptor having an insulating layer and having a color separation function in the plane, and performing development. This is achieved by an image forming apparatus characterized in that the image formation is controlled by specifying an area and a color of a document.

In the present specification, the above-mentioned "color" includes not only chromatic colors but also achromatic colors such as white, gray, and black.

〔Example〕

First, normal image formation according to the present invention will be described below with reference to illustrated examples.

5 to 10, FIG. 14, and FIG. 15 respectively show image carriers (photoreceptors) used in the multicolor image forming apparatus of the present invention.
11 to 13 are plan views showing arrangement rows of a plurality of types of filters in the insulating layer of the photoreceptor, and FIGS. 1 and 18 are cross-sectional views schematically showing the structure of the multicolor image of the present invention. FIG. 16 is a schematic diagram showing the configuration of an example of a forming apparatus, FIG. 16 is a process diagram showing the state in which image formation is performed in the multicolor image forming apparatus of the present invention, and FIG. 17 is a diagram showing the state in which the surface potential of the photoreceptor changes according to the process. The graph shown in chronological order, FIG. 20, is a portion showing an example of a developing device used in the multicolor image forming apparatus of the present invention.

In Figures 5 to 8, 1 is a cylindrical, endless belt made of metals such as aluminum, iron, nickel, copper, etc., or alloys thereof, and formed into an appropriate shape and structure as required. 2 is a photoconductor such as sulfur, selenium, amorphous silicon or an alloy containing sulfur, selenium, tellurium, arsenic, antimony, etc., or oxidation of metals such as zinc, aluminum, antimony, bismuth, cadmium, molybdenum, etc. Inorganic photoconductors such as iodides, sulfides, selenides, azo, disazo, trisazo, phthalonanine dyes and pigments, vinylcarbazole, trinitrofluorenone, polyvinylcarbazole, oxadiazole, hydrazone compounds, stilbene An organic compound in which a charge transport substance such as a derivative or styryl derivative is dispersed in an insulating binder resin such as polyethylene, polyester, polypropylene, polystyrene, polyvinyl chloride, polyvinyl acetate, polycarbonate, acrylic resin, silicone resin, fluorine resin, or epoxy resin. A photoconductive layer consisting of a photoconductor or a functionally separated photoconductive layer consisting of a charge generation layer and a charge transfer layer; 3 is red (R) formed from various polymers, resins, etc. and colorants such as dyes and pigments; Green (G), Blue (B
This is an insulating layer including a layer 3a made of a color separation filter such as ). The insulating layer 3 in the photoreceptor shown in FIG. 5 is formed by printing, vapor deposition, photoresist, or other means on the photoconductive layer 2 with an insulating material such as a resin colored with a coloring agent for forming a color separation filter. The insulating layer 3 in the photoreceptor shown in FIG. 6 is formed by forming a filter layer 3a in a predetermined pattern on the surface of a transparent insulating layer 3b formed by conventionally known means. 7th
The insulating layer 3 in the photoreceptor shown in the figure is formed by sandwiching a filter layer 3a between transparent insulating layers 3b, and the insulating layer 3 in the photoreceptor shown in FIG.
a, a transparent insulating layer 3b is formed on the outside thereof.

These filter layers 3a are formed by printing, vapor deposition, photoresist, or other means.

The insulating layer 3 may be formed by first forming an insulating film or sheet containing the filter layer 3a, and attaching or adhering it onto the photoconductive layer 2 by appropriate means.

In addition, the applicant had previously proposed a photoreceptor (patent application 1983-
199547).

For example, as shown in FIG. 9, an insulating layer 3c is provided on one side of the photoconductive layer 2, and a transparent conductive layer 1-2 and an insulating layer 3a consisting of a color separation filter are sequentially deposited on the other side. It has a laminated structure. The transparent conductive layer 1-2 is formed, for example, by vapor depositing a metal. In the photoreceptor having this structure, charging, which will be described later, is performed from the insulating layer 3c side, and increased exposure and full-surface exposure are performed from the insulating layer 3a side, which is a color separation filter.

Further, as shown in FIG. 1O, for example, in the case of a drum-shaped photoreceptor, a transparent insulating layer 3b is provided on the photoconductive layer 2, and R, G, and H filters are provided on the transparent insulating layer 3b with a minute gap md thereon. It is also possible to provide a layer 3-2 (similar to the layer 3a) coaxially.

That is, a cylindrical body 3 consisting of R, G, and B filters is placed on a drum-shaped photoreceptor without a filter, with a minute gap md.
-2 is fitted coaxially and integrated. With such a structure, any one of the filter layers having the structures shown in FIGS. 11, 12, and 13 (details will be described later) can be selected, replaced, and used. However, the gap md should not be too large so that the image of the filter cell is not extremely blurred and projected onto the insulating layer and the photoconductive layer.

Further, the transparent insulating layer 3b and the filter layer 3-2 are not completely separated from each other, and may be in contact with each other.

The filter layer 3a formed by adhering a coloring agent, colored resin, etc. to the insulating layer 3 has R and G colors.

Although the shape and arrangement of minute filters such as B are not particularly limited, it is preferable to have a striped distribution as shown in Figure 11 or to reproduce a delicate multicolor image, since pattern formation is easy. A mosaic distribution as shown in FIGS. 12 and 13 is preferable because of the fact that this is possible. R,G,
The direction in which the filters such as B are arranged may be in any direction in the spreading direction of the photoreceptor, not only in a mosaic distribution but also in a stripe distribution. That is, for example, in the case of a rotating drum-shaped photoreceptor, the periodic direction of the mosaic or stripe indicated by Q in the figure may be parallel to, perpendicular to, or oblique to the axis of the photoreceptor. R,G
If the individual size of filters such as , B, etc. becomes too large, the resolution and color reproducibility of the image will decrease, resulting in deterioration of the image quality.On the other hand, if the individual size of the filters, such as filters B and B, becomes too large, the image quality will deteriorate. If it is less than that, it will be easy to be influenced by other adjacent color parts, and it will be difficult to form a filter distribution pattern. Therefore, it is preferable that each filter portion has a width or size of 10 to 500 Izm in length, which is indicated by ρ in the figure.

Note that each filter preferably has high resistance. Particularly preferably, it is 10'3 Ωcm or more.

If the resistance is low, they can be electrically insulated from each other by providing a gap or interposing an insulator.

The layer 3a made of the color separation filter as described above is not provided,
A photoreceptor whose photoconductive layer is provided with a color separation function can also be used. Figures 14 and 15 were previously proposed by the applicant (Japanese Patent Application No. 59-201085, 60-2451,
No. 77) An example of a photoreceptor is shown. The photoreceptor shown in FIG. 14 has a photoconductive portion 2R having a required spectral sensitivity distribution on a conductive substrate 1.
12G, 2B, for example, a photoconductive layer 2-2 including a large number of photoconductive parts sensitive to red (R), green (G), and blue (B) is provided, and a transparent insulating layer 3b is provided thereon. There is. 15th
The photoreceptor shown in the figure has a conductive substrate I'' and a charge transfer layer 2-3b.
Part 2 B has a different spectral sensitivity distribution.
. The photoconductive layer 2-3 is constituted by the charge transfer layer 2-3b.The planar structure of the photoconductive layer 2-2 in FIG. 14 and the charge generation layer 2-3a in FIG. Similar to the insulating layer made of the decomposition filter, a planar structure similar to that shown in FIG. 11, FIG. 12, or FIG. 13 may be used.

First, the principle by which a multicolor image having the same colors as the original image (original image) is formed on the photoreceptor having the above structure will be explained with reference to FIG.

Note that FIG. 16 shows an example in which an n-type semiconductor photoconductor such as cadmium sulfide is used for the photoconductive layer 2 of the photoreceptor, and FIG. The same reference numerals indicate the same functional members.

FIG. 16 [1] shows a state in which the photoreceptor 4 is uniformly charged by positive corona discharge from the charger 5, and positive charges are generated on the surface of the insulating layer 3, and correspondingly, the photoconductive layer A negative charge is induced at the interface between photoreceptor 2 and insulating layer 3, and as a result, the surface of photoreceptor 4 exhibits a uniform potential as seen in the graph of potential E.

FIG. 16 [2] shows a change in the charged surface at a portion irradiated with the red image L, for example, in a state where the above-mentioned charged surface is subjected to image exposure by the image exposure device 6.

Since the red image passes through the R filter part of the insulating layer 3 and makes the part of the photoconductive layer 2 below it conductive, the electric charge on the surface of the insulating layer 3 and the light are removed by the charger I6 in that part. Negative charges at the interface between the conductive layer 2 and the insulating layer 3 disappear. Furthermore, the potential pattern is sufficiently smoothed by the charger 26.

On the other hand, since the G and B filter portions do not transmit the red image, the negative charges of the photoconductive layer 2 remain in those portions. The same applies to other color components of image exposure.

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, the charger 16 and the charger 26 of the image exposure device 6
Due to the action of becomes constant. The green component and the blue component of image exposure give similar results, and the state in which they are integrated is the state in which image exposure has been performed by the image exposure device 6, and as it is, it does not function as an electrostatic image.

FIG. 16 [3] shows a state in which the image exposure surface described above is uniformly exposed by the blue light LB of the lamp 7B. The blue light LB does not pass through the RSG filter portion and does not change those portions, but it passes through the I3 filter portion and makes the photoconductive layer 2 below it conductive, thereby increasing the photoconductivity of that portion. The charges at the upper and lower interfaces of the layer 2 are neutralized, and as a result, a potential pattern appears on the surface of the insulating layer 3 in the B filter portion, as shown in the graph, which gives a complementary color image of blue in the previous image exposure.

FIG. 16 [4] shows a state in which a potential pattern formed by full-surface 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 entire surface exposure process, and does not adhere to the R and G filter portions where the potential has not changed. As a result, a yellow toner image of one color (color separation) is formed on the surface of the photoreceptor 4.
The potential of the attached part (1,l will decrease somewhat due to development, but
Note that the surface potential is not uniform as shown in the graph.

FIG. 16 [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 this photoreceptor 4 is shown in a graph.

Subsequently, this yellow toner image is formed as shown in FIG.
5], the entire surface of the photoreceptor 4 is exposed to green light obtained from a lamp. Figure 16 [3]
As described above, a potential pattern appears in the G filter section this time. When this potential pattern is developed by a developing device containing magenta (magenta) toner, the magenta toner adheres only to the G filter portion, forming a magenta toner image as shown in FIG. 16 [4]. As a result, a two-color toner image is formed on the photoreceptor. Furthermore, corona discharge was applied to this image forming surface using a charger in the same manner as in FIG. 16 [5] to uniformly shift the surface potential. These processes are the first
Shown in Figure 5 [6], [7], and [8].

Subsequently, when the surface of the photoreceptor 4 on which the two-color toner images have been formed is entirely exposed to red light obtained by a lamp,
Also, as described in FIG. 16 [3], a potential pattern appears in the R filter portion, and this potential pattern is developed by a developing device that stores cyan toner, forming a cyan toner image. However, in this case, since it is a red image, no potential pattern is formed and cyan toner does not adhere. In this way, a red image is reproduced from yellow toner and magenta toner.

As a result of completing the above-42 steps, a clear three-color image without color shift or color turbidity is formed on the photoreceptor 4.

The reproduction of an original image using yellow, magenta, and so-toner toners using the three-color separation method performed as described below is summarized in Table 1 below.

The symbol [-・] in Table 1 indicates the insulating layer 3 and photoconductive layer 2 of the photoreceptor.
The formation of an image pattern of charge density at the interface of
○ means that an image-like potential pattern appears on the surface of the photoreceptor;
The symbol "0" 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 means that there is no toner attached.
Y, M, and C indicate that yellow toner, magenta toner, and cyan toner are attached, respectively.

A black image is reproduced from Y, M, and C toner deposited on each filter. In principle, this process is additive color mixing, but in reality, the toner is spread during the development, transfer, separation, and fixing steps, so subtractive color mixing occurs, and high image density and good black images are reproduced.

Furthermore, FIG. 17 shows each filter portion B, G, H of the photoreceptor.
5.16.26.7B on the horizontal axis shows a situation where the surface potential at
, 8Y, 9Y, 7G, 8M, 9M, 7R.

8C indicates a step in which members with the same reference numerals as those in FIG. 1 or FIG. 16 act on the photoreceptor 4, and B.

It shows the potential corresponding to the black background or white background of the document caused by full exposure with G and R light. (During the above processes, for example, between -order charging and secondary charging, and between whole surface exposure and development, etc., are omitted.) In FIG. 16, the photoconductive layer 2 of the photoreceptor 4 is an n-type photosemiconductor. Although an example is shown in which the photoconductive layer 2 is made of a p-type photosemiconductor such as selenium, the basic image forming process does not change except that the positive and negative signs of the charges are all reversed. Furthermore, if it is difficult to inject charges when charging the photoreceptor 4, uniform irradiation with light may also be used.

An example of obtaining a recorded image in which the original image (original image) is changed to another desired color (hereinafter referred to as color conversion) will be described below. As can be seen from Fig. 16 and Table 12-1, in order to reproduce the colors of the original using this image forming method, a potential pattern must be applied to the color separation filter portion that does not transmit the color components of the light from the original. is formed to form a latent image, and the latent image is developed with three primary color toners to reproduce color. Therefore, color conversion is possible by selecting a combination of exposure light for full-surface exposure and development to form the potential pattern.

The examples shown in Tables 2, 3, and 4 below are examples in which color conversion (partial color reproduction) is performed by changing the order of full-surface exposure with specific light compared to the procedure in Table 1 above. In the example in Table 2, the entire surface is exposed in the order of red light, green light, and blue light. As a result, in the area that was red in the original drawing, magenta toner adheres to the G filter area and cyan toner adheres to the B filter area, and the color is converted to blue by both toners.

In the portion that was green in the original image, yellow toner adheres to the R filter portion and cyan toner adheres to the B filter portion, and green is reproduced by both toners.

In the portion that was blue in the original image, yellow toner adheres to the R filter portion and magenta toner adheres to the G filter portion, and the color is converted to red. The red and blue colors of the original are thus exchanged for each other. Further, the yellow parts in the original drawing are converted to cyan, the cyan parts in the original drawing are converted to yellow, and the magenta parts and black parts in the original drawing are reproduced in their original colors.

As can be seen by comparing Table 2 with Table 1 above, by changing the order of overall exposure, the type of toner that adheres to each filter part is changed, and some colors of the original image are changed to other colors. Color conversion is performed, and the colors of some other parts of the original drawing are reproduced as they are.

The same applies to the examples in Table 3 and the examples in Table 4.

The example in Table 3 is an example in which the entire surface is exposed in the order of red light, blue light, and green light, and the red, green, and blue colors of the original image are converted to blue, red, and green, respectively.

In this case, the colors yellow, magenta, and cyan of the original image are converted to magenta, cyan, and yellow, respectively.

The example in Table 4 is an example in which the entire surface is exposed in the order of green light, red light, and blue light, and the red, green, and blue colors of the original image are converted to green, blue, and red, respectively.

In this case, the colors yellow, magenta, and cyan of the original image are converted to cyan, yellow, and magenta, respectively. As described above, in color conversion (partial color reproduction), desired color conversion can be performed by selecting the order of full-surface exposure with specific color light.

FIG. 2 shows an operation panel, and color conversion is performed by pressing buttons 1 and 2 on this operation panel and by area specifying means to be described later.

There is a trimming function selection button in the center of the operation panel in Figure 2, and a color selection button expresses the specified area in a specific color (Y, M, C, blue, green, red, black) determined by color specification. do. Achromatic erase is used to erase specified areas. If you press the color deletion button followed by the color specification button, the specified color will be deleted. Next, press the desired color specification button to determine the specified color.

The color conversion button indicates that color conversion within the specified area is to be performed according to the color specification.

The area inversion phase indicates that an area opposite to the specified area 1 is specified. This is done after specifying the area.

On the left side of the operation panel, the shape of the transfer paper is displayed on a color liquid crystal display, and the shape of the transfer paper is classified and displayed by color so that the results of the operations described above can be seen as to how the copy should be performed.

FIG. 3 shows operation buttons provided on the operation panel 2 for instructing color conversion. At the vertices of the equilateral triangle, (blue), (
(green) and (red), and a push button with a -→ mark is provided on each side of this equilateral triangle.

Following area designation and color conversion designation, the operator commands desired color conversion between two arbitrary colors by operating this button. To convert all three colors, operation 1 note is ``1''
The button provided in the center of the equilateral triangle marked with an 8-day (black) mark is pressed to command color conversion in the direction of the arrow. Color conversion from red to green, green to blue, blue to red? To exit, press the button with the black mark twice.

When the operator presses these buttons, the (blue) in Figure 4 will occur.
Below the (green) and (red) displays, the color to be converted is displayed by lighting a lamp.

In addition, in the full surface exposure shown in Tables 1 to 4, after the first full surface exposure, development, and charge removal, no charge remains on the photoreceptor, and the toner that has already adhered acts as a filter. Therefore, in the second and third full-face exposures, it is difficult to expose with light that includes the exposure light component of the previous full-face exposure.

Next, an example of obtaining a single color (monocolor or black and white) from a full color original drawing will be explained with reference to Tables 5, 6 and 7 of F. In the case of Tables 5 and 6, specify the area,
After specifying the color, press the color specification button. If there are multiple locations, repeat multiple times.

Full-surface exposure is performed continuously (Table 7 shows one full-surface exposure), and then development is performed.

Table 5 shows yellow, magenta,
An example of obtaining a monochrome image of either cyan or black and white will be shown. In this example, three types of full-surface exposure are performed in succession, and one type of toner is attached to all color separation filter parts using one selected developing device to obtain the above-mentioned monochrome or black and white image. This is an example.

Table 6 shows examples of obtaining monochrome red, blue, green, or black and white images from full-color originals. In this example, three types of full-surface exposure are performed in succession, and the selected two
This is an example in which two types of toner are attached to all the color separation filter portions using one developing device to obtain a monochrome or black and white image as described in item 1.

In the case of Table 7, the color to be erased and the color to be expressed are specified using the color specification buttons that follow the area specification and color erasure specification.

Table 7 shows how to remove a specific color from a full-color original drawing (in this example, the red part of the original drawing is converted to white).
An example of obtaining a red, blue, or green monochrome image or a black and white image will be shown below. After image exposure, the entire surface of the color to be removed (red in this example) is exposed, and then two types of toner are attached to one type of color separation filter (R filter in this example) using two selected developing devices. , to obtain the above-mentioned monochrome or black-and-white image without a specific color (red in this example).

When obtaining a monochrome image of yellow, magenta, or cyan without a specific color, it is sufficient to use one developing device corresponding to the color.

When removing a specific color, toner is deposited only on the portion of one type of color separation filter that transmits the exposure light during full-surface exposure, so the amount of toner deposited tends to be insufficient and the color tends to be pale. Therefore, during development, lower the voltage of the DC component of the developing bias described later, increase the voltage of the AC component, or lower the frequency of the AC component, etc.
It is desirable to increase the toner image density.

As mentioned above, in order to obtain a monochrome image, it is not necessary to prepare a dedicated developing device for monochrome development, but by selecting and using an appropriate developing device from among the developing devices for full color development, the image density can be improved. It can form monochrome images of yellow, magenta, cyan, red, blue, and green with excellent resolution.

The multicolor image forming apparatus shown in FIG. 1 forms an image based on the above principle, and performs color conversion based on Table 3, for example, in which the drum-shaped photoreceptor 4 rotates once in the direction of the arrow. During this process, a multicolor image is formed as follows. That is,
A charger 5 charges the surface of the photoreceptor 4 to a uniform potential, and an image exposure device 6 performs image exposure on the charged surface using reflected light from an original of white irradiation light using a halogen light source. The surface potential of the photoreceptor 4 is made approximately uniform by the action of the charger 16 which performs DC corona discharge of the opposite sign. Subsequently, a charger 26 similar to the charger 16 is used to completely flatten the surface potential of the photoreceptor 4.

Note that the charger 26 may be provided adjacent to and downstream of the charger 16 of the image exposure device 6, and both may be integrated.

Next, the image-exposed surface is uniformly irradiated with red light in place of the blue light Ls obtained by the lamp 7B without color conversion, thereby creating a potential pattern that provides a red complementary color image on the image-exposed surface. This is developed by a developing device 8Y that stores yellow toner. Subsequently, the surface potential of the photoreceptor 4 is made uniform by the action of a charger 9Y that performs corona discharge similar to the discharger 16. Next, a developing device 8M containing magenta toner uniformly irradiates blue light in place of the green LG obtained by the lamp 7G to form a complementary color image of green, and develops the magenta toner. , a two-color toner image is formed on the surface of the photoreceptor 4. Similarly, charger 9
Discharge of the charger 9M similar to Y, uniform irradiation of green light in place of the red light L obtained by the lamp 7R in the case of no color conversion, and development by the developing device 8C containing cyan toner. Through the above steps, a superimposed image of three color toner images of yellow, magenta, and cyan is formed on the photoreceptor 4.

In order to sharpen the image, white light is applied from the lamp 7K to the color separation filter portion on which toner has already adhered.
If a developing device 8K develops a potential portion of each color separation filter portion with black toner by utilizing a slightly generated potential pattern, an even better image is often obtained.

The multicolor toner image formed as described above passes through the developing device 8 containing black toner, which is in an inactive state, without being developed, and is charged by the pre-transfer charger 14. The image is easily transferred by the transfer device 10 onto the recording paper p fed from the paper feeder 15. The recording paper p onto which the multicolor toner image has been transferred is separated from the photoreceptor 4 by a separator 1 and sent to a fixing device 17 by a conveying means 16, where the multicolor toner image is fixed, and then finely discharged. Ru.

The surface of the photoreceptor 4 to which the multicolor toner image has been transferred is neutralized by a static eliminator 12 that performs exposure and discharge, residual toner is removed by a cleaning device 13, and the state returns to the state where the next image formation can be performed again.

In the multicolor image forming apparatus shown in FIG. 1, a monochrome image is formed as follows. That is, lamps 7G, 7R, 7K
And with chargers 9Y, 9M, and 9C in the non-operating state, similarly to the case of multicolor image formation, charging by charger 5, discharge and image exposure by charger 16 and charger 26, blue color by lamp 7B, The entire surface is exposed using white light with simultaneous exposure of green and red. As a result, a potential pattern appears on the entire surface of the photoreceptor 4. Developing device 8Y
A monochromatic toner image is obtained by developing with one or more of the above. Thereafter, as in the case of multicolor image formation, the formed monochrome toner image is transferred and fixed onto the recording paper p, and the surface of the photoreceptor 4 to which the monochrome toner image has been transferred is cleaned. For example, to obtain a red monochromatic image, developing devices 8Y and 8M are used to perform overlapping development.

For color conversion, an operator operates the operation panel 30, and this command is input to the central processing unit CPU, which controls the entire surface exposure devices 7B, 7G, 7R, and 7K.

Developing devices gv, 8M, 8G, 8, charger 9Y.

This is accomplished by causing 9M and 9C to operate as described above based on the above instructions. The contents of the operation panel 30 will be explained in detail later.

In the multicolor image forming process described above, each entire surface exposure does not necessarily have to be B, G, and R light. In other words, in the filter section where the entire surface of the photoreceptor has already been exposed, the charge at the interface between the insulating layer and the photoconductive layer has already disappeared, so even if light passes through it again, there will be only a slight change in the surface potential. be.

Therefore, even if the entire surface is exposed to light in the order of red light, yellow light, and white light, and development is performed with cyan toner, magenta toner, and yellow toner in that order, the color reproduction of the document will be good. You can get the image. Of course, the exposure is not limited to this, and the entire surface may be exposed with light having other spectral distributions.

As mentioned above, when the light from the entire surface exposure passes through a part of the filter on the photoreceptor twice or more, the light should be It is desirable to irradiate. In this way, the light for full-surface exposure forms a potential pattern only on the corresponding specific type of filter. (Japanese Patent Application No. 59-198171) As described above, according to the multicolor image forming apparatus of the present invention, not only can a multicolor image without color shift be obtained, but also excellent image density and resolution can be obtained. It is possible to form two monochromatic images.

The multicolor image forming apparatus shown in FIG.
This image forming apparatus differs from the image forming apparatus shown in FIG. 1 in that a colored toner image is formed.

Note that the full-surface exposure apparatus shown in FIGS. 1 and 18 includes a
As shown in FIGS. 26, 27, and 28, the entire surface is selectively exposed using specific color light.

Similar to the multicolor image forming apparatus shown in FIG. 1, this multicolor image forming apparatus performs the same image forming operation as described in FIG. 16 and Table 1, and produces multicolor images without color shift. A monochromatic image with excellent image density and resolution can be formed. That is,
For example, when forming a three-color image, the photoreceptor 4 is charged by the charger 5, image exposure is performed by the charger 16, and the surface potential is made uniform.
The entire surface is exposed to blue light, and the potential pattern formed thereby is developed by the developing device 8Y to form a yellow toner image. This toner image passes through the developing device 8M, 8C and 8 in Table 8 without being affected by the pre-transfer charger 14, the transfer device 10, the separator 11, the cleaning device 13 and the charger 5. The photoreceptor 4 on which the toner image is formed is
When it reaches the position of the charger 16, it is not irradiated with light but only receives corona discharge, so that the surface potential becomes uniform, and the entire surface is exposed to green light obtained from a lamp, forming a potential pattern. Subsequently, this is developed by a developing device 8M,
A magenta toner image is formed. Similarly, a potential pattern is formed using red light and development is performed by the developing device 8C to obtain a three-color toner image.

When performing color conversion using the multicolor image forming apparatus shown in FIG. 18, color conversion is performed by selecting the order of exposure light for the above-mentioned full-surface exposure and selecting the order of use of the developing devices. . Since the former method is the same as the method already explained in Tables 2 to 7, only the latter method will be explained below by exemplifying it in Tables 8 and 9 below.

\-ko7・' In Tables 8 and 9, the order of full-surface exposure is the same as the order in which the colors of the original image are reproduced as they are, and the order in which the developing devices are used is changed to perform color conversion. .

Table 8 is an example in which development is performed in the order of cyan, magenta, and yellow, and color conversion is performed between red and blue, similar to Table 2 described above.

Table 9 is an example in which development is performed in the order of cyan, yellow, and magenta, and color conversion is performed from red to green, green to blue, and blue to red, similar to Table 4 described above.

It goes without saying that color conversions other than those shown in Tables 8 and 9 are also possible by selecting the development order.

Various color conversions can be performed by selecting the development order as described above, and the development order is determined based on the color conversion command described above, and desired color conversion is performed.

When forming a monochromatic image, the entire surface of the charged and image-exposed photoreceptor 4 is exposed to blue light from a lamp 7, for example.
A color image is formed by forming a potential pattern of a part of a specific filter on the surface of the photoconductor 4, developing it in a specific one or more developing devices 8Y to 8, and transferring and fixing it. High-resolution monochromatic images can be obtained at faster speeds and with lower image density. Note that other combinations of lights may be used for the entire surface exposure, and it goes without saying that the entire surface may be exposed using three colors, that is, white light.

This multicolor image forming device has a simple configuration that is almost the same as a monochrome copying machine except for the increased number of developing devices. It has the advantage of achieving cost-effectiveness.

A magnetic brush developing device as shown in FIG. 20 is preferably used as the developing devices 8Y to 8K in the multicolor image forming apparatus shown in FIGS. 1 and 18.

The developing device shown in FIG. 20 includes a developing sleeve 81 and a magnet body 82 having N and S magnetic poles on the inner peripheral surface of the developing 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. Then, during the conveyance of the developer, the amount of conveyance is regulated by the layer thickness regulating plate 84 to form a developer layer, and the developer layer is applied to the photoconductor 4 in the developing area where the developing sleeve 81 faces, and the potential of the photoconductor 4 is Develop according to the pattern. During development, a developing bias voltage is applied to the developing sleeve 8I by a bias power supply 80. Further, even when development is not performed as necessary, the developing sleeve 81 is used to prevent toner from transferring from the developing sleeve 81 to the photoreceptor 4 or from the photoreceptor 4 to the developing sleeve 81. A bias voltage may also be applied.

That is, while only the yellow toner developer is operated and the electrostatic image is developed by the developer 8Y, the other developers 8M, 8C, 8, etc. shown in FIGS. 1 and 18 are operated. was kept undeveloped. This can be done by separating the developing sleeve 81 from the bias power supply 80 and leaving it in a floating state or by grounding it, or by actively applying only a DC bias voltage of the same polarity or opposite polarity to the toner charging to the developing sleeve 81. Among these, it is preferable to apply a DC bias voltage of opposite polarity to that of the toner.

Since the developing devices 8M, 8C, and 8 are also designed to perform development under the same non-contact jumping development conditions as the developing devices, the developer layer on the developing sleeve 81 does not need to be particularly removed. Further, a developing device that is not in use may be stopped. Of course, it is also effective to move the developing device away from the photoreceptor and to remove the developer from the sleeve. 85 is a cleaning blade that removes the developer layer that has passed through the development area from the developing sleeve 81 and returns it to the developer reservoir 83; 86 is the developer reservoir 83;
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 the developer layer, that is, the surface of the photoreceptor is directly rubbed with a magnetic brush, but especially after the second development, the developer layer is A developing method that does not contact the photoreceptor surface, such as U.S. Pat. No. 3,893,418,
Japanese Unexamined Patent Publication No. 18656/1983, especially Japanese Patent Application No. 58/57
No. 446, Japanese Patent Application No. 1982-238295, Japanese Patent Application No. 1983-
No. 238296, and Japanese Patent Application Nos. 58-139974 and 59-13997 for overlapping on the same latent image.
It is preferable to use the method described in each specification of No. 5. These methods use a one-component or two-component developer containing a non-magnetic toner whose coloring can be freely selected, create an alternating electric field in the development area, and perform development without contact between the electrostatic image support and the developer layer. It is something to do. This non-contact development
The gap between the developing sleeve and the surface of the photoreceptor is set to be larger than the layer thickness of the developer layer on the developing sleeve (provided there is no potential difference between the two), and with this gap and layer thickness, various types of Development is performed under certain conditions.

The color toner used for development can be made of various chromatic colors such as known binder resins, organic and inorganic pigments, dyes, etc. that are commonly used in toners. It is possible to use toner for electrostatic development made by known techniques, which consists of an achromatic colorant and various magnetic additives, etc., and as a carrier, iron powder, ferrite powder, etc., which are usually used for electrostatic images, can be used. Various known carriers can be used, such as a magnetic carrier coated with a resin or a magnetic carrier in which a magnetic material is dispersed in a resin.

In addition, the applicant filed the patent application No. 58-24966 earlier.
The developing method described in No. 9, No. 240066 may be used. FIG. 2 is a plan view of a panel for color conversion commands, and normally copies can be made without using trimming as shown below. It will be done. The color designation section is equipped with the operation buttons for color conversion shown in Figure 3 and the color conversion display section shown in Figure 4, as well as full color and monocolor mode selection operation buttons, a clear button, and an image density adjustment button. , push button for specifying the number of copies and clearing,
A number-of-copies display section is provided.

When color conversion is not performed, the mono button forms a black and white image, and the color button reproduces colors faithful to the original image.

To perform color conversion, press the color button and then press a predetermined button in the color designation section. For example, when converting between blue and green, do not press the mouth (-1) button.

Press the mouth (black) button to convert blue to green, green to red, and red to blue. Blue to red, green to blue,
To convert red to green, press the mouth (black) button twice.

To perform color conversion in monochrome, press the mouth (mono) button, then select (blue), (green), (red), mouth (black) in the color specification area.
Press one of the buttons. For example, if you want to obtain a red monochrome image, press the (red) button.

The specified color conversion is displayed on the color conversion display section by lighting up a color lamp of the corresponding color.

When using trimming, use the trimming button on the operation panel and area designation.

The rest is the same as in a normal copying machine.

In the multicolor image forming apparatus shown in FIG. 1 or FIG. 18, for color conversion, the CPU connected to the operation panel 30 determines the order of full-surface exposure and development suitable for performing the color conversion instructed, and the optimum development. Conditions are selected, the components of the image forming apparatus are controlled, and image formation is performed.

The present invention will be described below with reference to specific examples.

The photoreceptor 4 in the multicolor image forming apparatus shown in FIG.
Second, it consists of a mosaic arrangement of R, G, and B filter parts as shown in Figure 12, and each filter has a length of Q.
was 100 μm, an insulating layer with a thickness of 20 μm was provided, the outer diameter was 180 mm, and the surface speed was 200 mm/sθC. The developing device 8Y, 8M, 80°8K has the first
A developing device having the structure shown in FIG. 6 was used.

The developing sleeve 81 is made of non-magnetic stainless steel, has an outer diameter of 20 mm, and rotates in the direction of the arrow at a surface speed of 140 mm/sec during development. The magnet body 82 has eight N and S magnetic poles, provides a maximum magnetic flux density of 800 G to the surface of the developing sleeve 81, and rotates in the direction of the arrow at 600 rpm during development.

The surface gap between the photoreceptor 4 and the developing sleeve 81 is the same as that of each developing device 8.
The thickness was set equally to 0.75 mm for Y, 8M, 8C, and 8K, so that a developer layer with a thickness of 0.5 mm was formed on the developing sleeve 81. The developer has an average particle size of 10 μm.
The weight ratio of toner triboelectrically charged to 10 to +30 μc/g and a carrier made of a resin containing dispersed magnetic material with an average particle size of 25 μm and a resistivity of 1013 Ωcm or more = 48-
It was mixed with The toner color is different from each developing device 8Y,
Of course, 8M, 8C, and 8 are different from yellow, magenta, cyan, and black.

A corotron discharger is used as the charger 5, and the charger is 16°2.
Scorotron dischargers were used for all of 6.9Y, 9M, and 9C. Then, a discharge voltage that makes the surface potential of the photoconductor 4 -1.5 KV is applied to the charger 5, and the surface potential is set to +15 KV to the discharger 61 and the chargers 9Y and 9M.
A discharge voltage was applied such that the discharge voltage was 0. When the developing devices 8Y, 8M, and 8C each perform development, a developing bias voltage consisting of a DC voltage of +toov and an AC voltage with an effective value of 5 KV and a frequency of 2 KHz is applied to the developing sleeve 81, When the developing device 8K performs development, a developing bias voltage consisting of a DC voltage of +100 V and an AC voltage having an effective value of 12 KV and a frequency of 2 K i (Z) is applied to the developing sleeve 81.

Under the above conditions, when we performed the color conversion of the three-color image as described in Tables 2 to 6, we obtained a three-color image with good color tone without color shift, and excellent resolution with high image density and contrast. An m-color image was obtained.

In addition, when forming a monochromatic image in which the specific colors shown in Table 7 are omitted, sufficient image density is not obtained under the same conditions, so the developing conditions are set by changing only the AC voltage to 2.5 KV. As a result, a monochromatic image similar to that described above was obtained.

Note that the results obtained when color conversion was performed from a full-color original image by the methods shown in Tables 8 and 9 using the multicolor image forming apparatus shown in FIG. 18 were also similar to the above results.

Single-color images of red, blue, and green can be easily obtained by superimposing two types of toner one above the other (see Tables 6 and 7).

The above examples are all examples of regular image formation, but the present invention is disclosed in Japanese Patent Application No. 59-199547.59-20
1084.59-201 [185,59-187045
Needless to say, the present invention can be similarly applied to a photoreceptor having a color separation function and a reversal image forming method as shown in the above.

The area specifying means for the next screen will be explained. Various methods can be used to specify the area of the document 22 depending on the logic of the CPU processing program that processes the position data from the input tabs 1/ヾ) and 25, but here we will manually specify the point coordinates one by one. Next, a case will be explained in which the inside of a polygon formed by connecting input points with straight lines in the order of input is specified as an area. FIG. 21 shows the area designation board 23 of FIG. 1 viewed from one side.

First, in order to start the area specification operation, when the IN button 27 provided at the bottom of the area specification board 23 is pressed, the input tablet 25 will be sequentially D1, D2, D3, D4,
D, and finally specify the color of that part (after pressing the color selection, color erasure, or color conversion button) on the operation panel 3.
When you press the button above 0, cpuJ2'1 D1 to D5
A polygon whose points are connected by straight lines, D.

At the same time that the area surrounded by D s D 4 D 5 and the designated color within that area are input, the system returns to a state of waiting for coordinate input. It is also displayed on a color display.

At this time, if you do not want to specify any more areas, press the E ND button 29 to end the input operation, and if you want to continue inputting areas and color fingers, repeat the above operation.
Finally, by pressing the END button 29, the area and the color for each area are designated.

After specifying the area of the original 22 on the area specifying board 23 and specifying the development color for each area, the original 22 is placed on the copy side for image exposure to form an electrostatic latent image on the surface of the photoreceptor 4. The document 21 is placed face down on the document placement table 21, but at this time, the edges a and b of the document 21 are placed on the document placement table X'.
and Y' coordinate to match each other. By this operation, the X and Y coordinates on the input tablet 25 can be made to correspond to the x' and y' coordinates on the document table 21. The drum of the photoreceptor 4 rotates in the direction of the arrow in FIG. 1 in synchronization with the operation of the image exposure device 6.
As a result, an electrostatic latent image of the original 22 is formed on the photoreceptor 4.

In this case, on the surface of the photoreceptor 4, the coordinate parallel to the drum axis of the photoreceptor 4 corresponds to the X' axis, and the circumferential direction corresponds to the Y' axis. The full surface exposure device 7W superimposes white light exposure on at least a portion of the electrostatic latent image of the document 22 that is being formed by the optical image exposure device 6, and removes the charge from the non-exposed portion of the electrostatic latent image. It is something to be erased. The entire surface exposure device 7W is constituted by a guide light emitting element array in which semiconductor light emitting elements such as LEDs are arranged parallel to the rotation axis of the photoreceptor 4 and along the surface of the photoreceptor 4. Therefore, since the semiconductor light emitting element array is arranged along the X' axis, the Y'
In the axial direction, the Y'
In the axial direction, by adjusting the lighting time of the semiconductor light emitting element, it is possible to perform exposure corresponding to a predetermined area and erase the electrostatic latent image in the area other than the imagewise exposed area. Next, full-surface exposure devices 7.7B, 7G, 7R, and 7K
Area designation development for each specific color using is explained below.

The electrostatic latent images formed one after another on the surface of the photoconductor 4 by the image exposure device 6 move toward the exposure point of the full surface exposure device 7B as the photoconductor 4 rotates, and the electrostatic latent images are After a predetermined time has elapsed after formation, the image reaches the exposure point from the image forming point of the image exposure device 6. Therefore, the coordinates of the coordinate input device and the original table 2
Since the coordinates 1 correspond to each other, by detecting the positional relationship between the document mounting table 21 and the image exposure device 6, the coordinates of the electrostatic latent image and the positional relationship of the entire surface exposure device 7 can be determined, and the Y' axis direction is By selectively lighting up the semiconductor light emitting elements of the semiconductor light emitting element array of the whole surface exposure device 7, and by adjusting the lighting time of the semiconductor light emitting elements in the Y' axis direction, exposure corresponding to a predetermined area can be performed. It is possible to generate a potential pattern in the exposed area and form a yellow toner image only in this area. 7G and 7R
Similarly, magenta toner images and cyan toner images can be formed only in designated areas. The process of forming potential pattern regions corresponding to each color toner image will now be described with reference to FIGS. 22 to 24.

(1) For color originals, area 1 contains the color image, area ■
In this example, a color-converted image is created, and in area (2), a cyan monochrome image is created.

In the photoreceptor 4 in FIG. 22,
The hatched area is the area where the electrostatic latent image or potential pattern of the original 22 exists, and the area without the hatching is the area where the potential pattern of the electrostatic latent image is not generated. The hatched areas indicate that the semiconductor light emitting elements of the semiconductor light emitting element array are turned on, and the non-shaded areas are turned off.

FIG. 22(a) shows a state in which an electrostatic latent image is formed on the photoreceptor 4 and is moving toward the full-surface electroluminescent device.
In b), the leading edge of the electrostatic latent image has arrived at a position where the entire surface can be exposed by the entire surface exposure device 7.

Between (a) and (b), the entire surface exposure device is turned on and off, so that there is no effect on the electrostatic latent image, and the light is normally off. While the image forming body moves from the state (C) to the state (e), each full-surface exposure device is repeatedly turned on and off. 22nd
At the point in time when the light passes through the area (e), the entire surface exposure device 7B applies blue light to the area I and red light to the area (2). On the other hand, area (3) is not exposed. Develop this with yellow toner. After recharging, the entire surface exposure device 7G applies green light to areas I and 2 as shown in FIG. 23, while area 2 is not exposed.

Develop this with magenta toner. After recharging, the gold surface exposure device 7R applies red light to region (2), blue light to region (2), and white light consisting of blue light, green light, and red light to region (2), as shown in FIG. 24. light is given. Develop this with cyan toner.

The entire surface exposure device 7K and the developing device 8 were not operated.

By doing this, area 1 has a color image in Table 1, area ■ has a color converted image obtained by converting blue and red from Table 2, and area ■ has a cyan monochrome image shown in Table 5. can get.

(2) Next, a case is shown in which a cyan image is obtained in area 2, a red image is obtained in area 2, and a recorded image is obtained in area 2 from a black and white original. At this time, the entire surface exposure device 7B applies blue light to the areas 12 and 2. On the other hand, area (3) is not exposed. Develop this with yellow toner. After recharging, green light is applied to region (2) by the gold surface exposure device 7G, while regions I and (2) are not exposed. Develop this with magenta toner. After recharging, the gold surface exposure device 7R exposes areas I and ① as shown in FIG.
is given red light and area ■ is not exposed. Develop this with cyan toner. The entire surface exposure device 7 and the developing device 8
I couldn't get it to work. By doing this, a cyan monochrome image is obtained in the area (2), a red monochrome image is obtained from the yellow toner and magenta toner in the area (2), and a green monochrome image is obtained from the yellow toner and cyan toner in the area (2).

As seen from examples (1) and (2) above, it is possible to obtain a wide variety of color copies by combining the area specification technique with the color conversion and color removal methods described in Tables 2 to 9. can. Some of the typical ones are shown below.

I. Obtain a color copy with arbitrary coloring in an arbitrary area from a black and white original.

2. Obtain a color copy and a black-and-white copy by erasing a plurality of arbitrary areas from a color original. For this purpose, it is not necessary to selectively apply full-surface exposure.

3. Obtain a color copy of any color by erasing a specific area from a monochrome original.

4. Obtain a color copy in which any one or more arbitrary areas of a color original are subjected to arbitrary color conversion or color removal.

Note that when the boundary line of the area is parallel to the rotation axis of the photoreceptor 4 as shown in FIG. 25, toner development switching (operation,
You can colorize, remove color, or convert colors in any area simply by changing the color (including inactivation).

The full-surface exposure device 7 is composed of a semiconductor light-emitting element array as shown in FIG. 19, and the full-surface exposure device A1 shown in FIG. 27 is composed of a combination of a color filter stripe array and a liquid crystal shutter array as shown in FIG. 26. Full-face exposure device B1 using a linear color cathode ray tube, or full-face exposure device C1 combining three types of filters and a liquid crystal shutter array as shown in FIG.
As shown in the figure, a full-surface exposure device in which liquid crystal glitters are arranged independently can be used. B for white light.

G and R specific lights can be used in combination.

These full-surface exposure devices use lenses and light converging element arrays (
By using SELFOC (trade name) to form an image on the image forming body, it is possible to specify the position with high positional accuracy.

〔Effect of the invention〕

As described above, according to the present invention, the area specifying means specifies the area of the document, and the development color, erasure, or color conversion of the area is specified, and the area corresponding to each development color is only exposed to white or the entire surface exposure device. By generating an electrostatic development potential pattern of
Color specified in any area with just one original document,
This has the excellent effect of realizing an electrophotographic image forming apparatus that can easily and efficiently produce a wide variety of copies that have been subjected to color removal and color conversion.

[Brief explanation of drawings]

The drawings all show embodiments of the present invention, in which Fig. 1 is a schematic front view of the interior of the image forming apparatus, Fig. 2 is a plan view of the operation panel, and Fig. 3 shows color conversion commands on the operation panel. Fig. 4 shows the color display section of the operation panel, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10,
14 and 15 are cross-sectional views of the photoreceptor; FIGS. 11, 12, and 13 are plan views of the photoreceptor; FIG. 16 is a process flow diagram for explaining the image forming process; The figure is a graph showing changes in photoreceptor surface potential during the image forming process. Figure 18 is a schematic front view of the interior of another image forming device. Figure 19 is a cross-sectional view of the entire surface exposure device. Figure 20 is a cross-section of the developing device. Figure 21 is a top view of the area designation board, Figure 22 is a diagram explaining the process of generating a potential pattern only for area ■ on the photoreceptor, and Figure 23 is for area ■ only on the photoreceptor. Figure 24 is a diagram illustrating the process of generating a potential pattern of only the area (■) on the photoconductor. Figure 25 is a diagram illustrating the process of generating a potential pattern of only the area (■) on the photoconductor. FIG. 26 is an explanatory diagram of the entire surface exposure apparatus A, FIG. 27 is an explanatory diagram of the entire surface exposure apparatus B, FIG. 28 is an explanatory diagram of the entire surface exposure apparatus C, and FIG. 29 is an explanatory diagram of the entire surface exposure apparatus R. This is an explanatory diagram. In addition, in the reference numerals shown in the drawings, 1... Conductive substrate 2... Photoconductive layer 3... Insulating layer 3a... Filter layer B... Blue color separation filter G... Green color separation filter R...Red color separation filter 4...Photoreceptor 5, 16.26.9Y, 9M, 9C...Charger 6...Image exposure device 7.7B, 7G, 7R...・・Full exposure device FB, FG,
PR... Filter 8 Y, 8M, 8 C, 8K... Developing device 21, document mounting table 22, document 23, area designation board 24, input pen 25, input tablet 30, ...It is an operation panel. Applicant Konishi Roku Photo Industry Co., Ltd. Figure 27 Figure 28 Figure 78-, ns'.

Claims (3)

[Claims] (1) A charging means, an image exposing means, facing a photoreceptor having an insulating layer and having a color separation function in the plane;
1. A color image forming apparatus, comprising: an entire surface exposure means and a developing means; the image formation is performed by developing; and the image formation is controlled by specifying an area of a document and specifying a color. (2) The color image forming apparatus according to claim 1, wherein the entire surface exposure is controlled in accordance with the designation. (3) The color image forming apparatus according to claim 1, wherein development is controlled in accordance with the designation.