JPS6199161A - Multi-color image forming method - Google Patents

Abstract

PURPOSE:To adjust easily color balance in the stage of subjecting a photosensitive body having a distribution layer of plural kinds of filters to the 2nd and subsequent full-surface exposure by varying the conditions for each second electrostatic charge with respect to the electrostatic charge of the first image exposure. CONSTITUTION:The photosensitive body 4 constituted of an insulating layer 2 consisting of the distribution of plural kinds of the filters, a photoconductive layer 1 and a conductive layer 3 is subjected to the electrostatic charge by an electrostatic charger 5 and the image exposure by an image exposing device 6. The filter part of the specific kind among the filters on the surface of the layer 2 is then subjected to the full-surface exposure by a lamp to generate a potential pattern and a toner image is formed by a developing device to said part. The photosensitive body is again subjected to the electrostatic charge by an electrostatic charger 9 in order to prevent the generation of color clouding in the formation of the toner different in color to be executed in the next stage. The color balance of the multi-color image to be reproduced is adjusted by changing relatively the discharge conditions of a discharger 61 and the charger 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multicolor image forming method using a photoreceptor suitable for forming multicolor images by electrophotography.

[Prior art]

Many methods and devices used therefor have been proposed for the purpose of obtaining multicolor images by electrophotography, but they can be generally classified into the following types. Part 1
One method is to use a single photoreceptor and repeatedly form a latent image by image exposure and development with color toner depending on the number of separated colors, so that the colors are layered on the photoreceptor. In this method, the colors are transferred onto the transfer material and the colors are overlapped on the transfer material. The second method uses a device having a plurality of photoconductors corresponding to the number of separated colors, simultaneously exposes each photoconductor with a light image of each color, and transfers the latent image formed on each photoconductor to color toner. This is a method in which a multicolor image is obtained by developing the image with a silica and sequentially transferring the colors to a transfer stopper to overlap the colors.

The first method has a major drawback in that it is necessary to repeat the formation and development process of a plurality of latent images, and that it takes time to record images, and it is extremely difficult to speed up the process. In addition, the second method uses multiple photoreceptors in parallel, which is advantageous in terms of high speed, but requires multiple photoreceptors, an optical system, a developing means, etc., making the device complex, large, and expensive. In fact, there is little compatibility due to the price. In addition, both methods have the major drawback that it is difficult to align images during multiple image formations and transfers, and it is not possible to completely prevent image color misregistration. It also has the disadvantage that it is difficult to adjust.

In order to fundamentally solve these problems, it is sufficient to record a multicolor image on a single photoreceptor with one image exposure, but the reality is that such a system has not yet been developed.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and it is possible to form a multicolor image on a single photoreceptor at high speed with one image exposure, and the apparatus can be configured compactly. Furthermore, the present invention provides a multicolor image forming method in which color balance can be easily adjusted.

[Structure of the invention]

The present invention has an insulating layer on one side of a photoconductive layer and a conductive layer on the other side, and at least one of the insulating layer or the conductive layer is translucent, and a plurality of types of filters are distributed. Using a photoreceptor for forming a multicolor image having a layer of In a method of forming a multicolor image by repeating the entire surface exposure to generate the image and the development of the potential pattern, with recharging applied before the second and subsequent whole surface exposures, the charging at the time of the image exposure and each recharging are performed. The above object is achieved by a multicolor image forming method characterized in that the color balance of a multicolor image is adjusted by making at least one of the conditions variable. 0 [Example] The present invention will be described below with reference to illustrated examples.

In the following explanation, red (R), which transmits only red light, green light, and blue light, will be used as a color separation filter.
, green (G), and blue fBl filters and a method for forming a multicolor image using the photoreceptor, the color of the color separation filter and the color of the toner used in combination with the color separation filter in the present invention will be described. is not limited to this.

1 to 13 are cross-sectional views schematically showing examples of the laminated structure of the photoreceptor used in the method of the present invention, and FIGS. 14 to 16 are filter layers showing examples of the distribution of color separation filters, respectively. A plan view, FIG. 17 is a process diagram for explaining the multicolor image forming method of the present invention, and FIG. 18 is a photoreceptor surface for explaining that color balance can be adjusted by changing conditions such as recharging. Potential change graph, Fig. 19,
.

20 and 22 are schematic front views showing an example of a recording apparatus that implements the method of the present invention, and FIG.
FIG. 3 is a schematic side view showing an image exposure portion of the recording device shown in the figure.

In FIGS. 1 to 13, 1 represents sulfur, selenium, amorphous silicon, or sulfur, selenium, or tellurium.

Photoconductors such as alloys containing arsenic, antimony, etc., or oxides of metals such as zinc, aluminum, antimony, bismuth, cadmium, molybdenum, etc.

Inorganic photoconductors such as iodides, sulfides, selenides, or vinylcarbazole, anthracephthalocyanine, trinitrofluorenone, polyvinylcarbazole,
Organic photoconductive substances such as polyvinylanthracene and polyvinylpyrene are mixed into insulating binder resins such as polyethylene, polyester, polypropylene, polystyrene, polyvinyl chloride, polyvinyl acetate, polycarbonate, acrylic resin, silicone resin, fluorine resin, and epoxy resin. a photoconductive layer consisting of a dispersed organic photoconductor; 2 an insulating layer; 3
is a conductive layer.

The insulating layer 2 shown in FIGS. 1 to 4 and 9 to 13 is translucent, and is based on the distribution of red (R), green (G), and blue (Bl) color separation filters. Filter layer 2a consisting of
has. Of these, Figures 1 and 9.

The insulating layer 2 in Fig. 13 is entirely a filter layer 2a, and is made of an insulating material such as a transparent resin colored by adding colorants such as red, green, and blue dyes. It can be formed by adhering it to the conductive layer 1 in a predetermined pattern by means such as printing.

On the other hand, in the insulation WJ2 shown in FIGS. 2 to 4 and 10 to 12, a part of the layer is the filter layer 2a, and the insulation layer shown in FIGS. 2, a transparent insulating layer 2b made of transparent resin or the like is provided on the photoconductive layer 1, and a predetermined pattern is formed on the transparent insulating layer 2b by the same method as the above-described method for forming the filter layer or by means of printing, vapor deposition, etc. The insulating layer 2 of FIGS. 3 and 11 in which the filter layer 2a is provided by an adhesion method is the insulating layer 2 in FIGS. 4 and 12 in which the transparent insulating layer 2b is further provided on the filter MZa. A filter layer 2a is provided on the photoconductive layer 1 in the same manner as described above, and a transparent insulating layer 2b is provided on top of the filter layer 2a.
It has been established. Figure 2.

The entire transparent insulating layer 2b between the photoconductive layer 1 and the filter layer 2a in the insulating layer 2 in FIGS. 3, 10, and 11 or a partial layer on the photoconductive layer 1 side is a transparent adhesive layer. There may be. That is, these insulating layers 2 may be formed into a film and bonded to the photoconductive layer 1 with a transparent adhesive. Unlike the above, the insulation N2 in FIGS. 5 to 8
does not have a filter layer, and is not limited to being translucent, but may be non-transparent.

The conductive layer 3 in FIGS. 1-1 to 4 is a non-light-transparent conductive layer made entirely of metals such as aluminum, iron, nickel, copper, or alloys thereof, as in conventional photoreceptors. be. On the other hand, the conductive layer 3 in FIGS. 5 to 13 is a transparent conductive layer made of aluminum or silver in contact with the photoconductive layer 1.

h, = a vapor-deposited or sputtered layer of a metal such as gold, rim, molybdenum, thimene, platinum, or a vapor-deposited layer of a metal oxide such as indium oxide, tin oxide, indium-tin oxide, etc.; It consists of a laminate of a transparent conductive thin layer 3b and a filter layer 3a similar to that in the insulating layer 2 described above or a transparent layer 30 as well. In the conductive layer 3 having such a filter layer 3a, a conductive substance such as a conductive resin is used for the filter layer 3a and the transparent layer 3C.
In this case, the conductive thin layer 3b may not be provided.

In the present invention, the photoreceptor 4 having the laminated structure as described above is used in the form of a cylinder, belt, or plate.

Note that the insulating layer 2 in the photoreceptor 4 in FIGS. 9 to 12
The filter layer 2a of the conductive layer 3 and the filter layer 3a of the conductive layer 3 are R,
The arrangement pattern and arrangement order of the G and B filters are exactly the same, and the same color filters correspond to each other, but in the photoreceptor 4 shown in Fig. 13, the arrangement order is different and different color combinations are used. ing.

The shape and arrangement of the R, G, and B filters in the filters M2a and 3a are not particularly limited, but a striped arrangement as shown in FIG. 14 is preferred because pattern formation is easy. A mosaic arrangement as shown in FIGS. 15 and 16 is preferable in that delicate multicolor images can be reproduced.

The direction in which the R, G, and B filters 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 length direction of the stripes may be parallel to the axis of the photoreceptor, at right angles, or in a helical direction. However, if the individual sizes of the R, G, and B filters are too large, the resolution and color mixing properties of the image will decrease, resulting in deterioration of image quality; Or even if it is less than that, it becomes easier to be affected by other color parts that come into contact with it momentarily, and it becomes difficult to form the distribution pattern of the filter, so three types of filters as shown in the example In the case of the distribution, the length l of one cycle of the repeating array is 30 to 50
It is preferable that the width or size is 0 μm. Note that the combination of color separation filters is not limited to the three types of R, G, and H, and the colors and number of types can be changed, so if the number of types changes, the above-mentioned preferred range of length l should be applied. will also start to change.

Next, the multicolor image forming method of the present invention using the above-mentioned photoreceptor 4 will be explained with reference to FIGS. 17 and 18. In addition,
FIG. 17 shows an example in which an n-type semiconductor photoconductor such as cadmium sulfide is used for the photoconductive layer 1 of the photoreceptor 4, and FIG. 17 also has the same reference numerals as in FIGS. indicate the same functional members.

FIG. 17 [1] shows a state in which the photoreceptor 4 is uniformly charged from the insulating layer 2 side by the positive corona discharge of the charger 5. In this state, positive charges are generated on the surface of the insulating layer 2, and correspondingly negative charges are induced at the interface between the photoconductive layer 1 and the insulating layer 2, and as a result, the surface potential E of the photoreceptor 4 is It becomes uniform as you can see in the graph.

FIG. 17 [2] shows a change in the charging state of the photoreceptor 4 due to the red component LR of the image exposure light that the image exposure device 6 makes incident on the above-mentioned charged portion. This image exposure device 6 includes a discharger 61
The photoreceptor 4 is given image exposure to the photoreceptor 4 while discharging an alternating current or an electric charge of the opposite sign to that of the charger 5. In this case, the photoreceptor 4 has the structure shown in FIGS. It has a layer structure as shown in FIG. 4 or FIGS. 9 to 13. When the photoreceptor 4 has a layer structure as shown in FIGS. 5 to 8 in which the insulating layer 2 does not include a filter layer, image exposure is applied from the side of the conductive layer 3 having the filter layer 3a. become.

In the photoreceptor 4 shown in FIGS. 9 to 13, imagewise exposure may be applied from the conductive layer 3 side. In the illustrated example, the red component LR of the image exposure passes through the R filter portion of the insulating layer 2 and makes the portion of the photoconductive layer l below it conductive. The negative charge at the interface with 2 disappears.

Further, since the G and B filter portions do not transmit the red component LR, the negative charges of the photoconductive layer 1 remain in those portions. As a result, the surface potential E of the photoreceptor 4 becomes uniform due to the discharge of the discharger 61, both in the R filter portion where the negative charge has disappeared and in the remaining G and B filter portions. This is because the positive charges on the surface of the insulating layer 2 are distributed in accordance with the negative charges at the boundary between the photoconductive layer 1 and the insulating layer 2, and a balance is maintained. The green and blue components of image exposure give similar results. Therefore, the state of the surface of the photoreceptor 4 subjected to image exposure by the image exposure device 6 does not function as an electrostatic image. In the above, image exposure is performed on the filter layer 3a.
The same applies to the case where it is applied from the side of the conductive layer 3 having the .

FIG. 17 [3] shows the change in the charged state of the photoreceptor 4 when the blue light LB obtained by passing the light from the lamp 7 through the filter FB is uniformly incident on the surface subjected to the above-mentioned image exposure. It shows. In the case of the photoreceptor 4 shown in FIGS. 9 to 13, the entire surface exposure with specific light that produces this potential pattern may be performed from the side opposite to the image exposure. The blue light LB does not pass through the R and G filter portions and does not affect those portions, but it passes through the B filter portion and makes the photoconductive layer 1 in that portion conductive. This neutralizes the charges in the photoconductive layer 1 in the B filter portion. As a result, in the B filter portion, a potential pattern appears on the surface of the insulating layer 2 that provides a complementary color image of blue formed by the previous imagewise exposure. This is shown in the lower graph of FIG. 17 [3].

FIG. 17 [4] shows a state in which an electrostatic image formed by full-surface exposure to blue light LB is developed by a developing device 8Y containing negatively charged yellow toner TY, which is a complementary color to blue. . The yellow toner TY is shown in Fig. 17 [3
] R and G adhered only to the surface of the insulating layer 2 of the B filter part whose potential changed due to full-surface exposure, and whose potential did not change.
It does not adhere to the filter part. As a result, a color-separated one-color yellow toner image is formed on the surface of the photoreceptor 4. The potential pattern formed by full-surface exposure is partially canceled out by development, but it is usually not uniform. The lower graph in FIG. 17 [4] shows this situation.

FIG. 17 [5] shows a state in which the surface potential of the photoreceptor 4 after development is made uniform by discharge from the charger 9 similar to the discharger 61 of the image exposure device 6.

This step is intended to prevent toner of a different color from adhering to the previously formed toner image during the next development, causing color smearing. By relatively changing the discharge conditions of 9, the color balance of the reproduced multicolor image can be adjusted.

The reason why this color balance adjustment is possible will be explained first with reference to FIG.

FIG. 18 shows changes in the surface potential of the photoreceptor during repetition of steps [1] to [5] and steps similar to steps [3] to [5] in FIG. 17 described above. And [3] ~ [5]
The dashed-dotted line and dashed line in the process of (3) indicate the change in potential of the black background and white background caused by uniform exposure to blue light, respectively;
] section shows changes due to development with yellow toner, and section [5] indicates changes due to recharging. Also, [3'] ~ [5'
The two-dot chain line and the dashed line in the process of [4] indicate the potential change in the black background area and the white background area caused by uniform exposure with green light, respectively;
] Part changes due to development with magenta toner, [5']
The area shows changes due to recharging. (3″) ~ [4′]
Similarly, the three-dot chain line and the broken line in the process of [3'
] part is the change due to uniform exposure, and part [4'] is the change due to development with cyan toner.

In the illustrated example, the surface area of the photoreceptor 40 is 600 to
At least one of the discharger 61 in step [2] and the charger 9 in steps [5] and [5'] uses a discharge wire or a scorotron charger so that each voltage can be controlled in the range of 100V. In some cases, the grid is also configured so that the applied voltage can be controlled. it is,
When using an AC discharger or AC charger, you can apply an AC voltage with a DC component to the discharge wire, or apply an AC voltage to the discharge wire and a DC voltage to the plate electrode. It also includes those that control the applied voltage and current.

As shown in FIG. 18, in general, if the surface potential of the photoreceptor 4 is high at the time when charging by the discharger 61 or the charger 9 is completed, the surface potential during subsequent full-surface exposure will also be high. Therefore, for example, if the surface potential is set to -100V in the step [2] and the entire surface is exposed to blue light in [3], the surface potential of the B filter part will be d"4007'!"l, (2) o
When Iafim'tQt-°7 is used and the entire surface is exposed in [3], the surface potential of the B filter part) becomes 500
Therefore, if the developing conditions are constant, the amount of yellow toner deposited can be controlled, such that more yellow toner deposits in the latter step in step [4]. In addition, when controlling the adhesion amount of magenta toner, for example, r
In step 5), when the surface potential is set to 150 V and the entire surface is exposed to green light in [3'], the surface potential of the G filter part becomes 550 V. In step [5], the surface potential is set to -100 V.
When the entire surface is exposed in step [3'], the surface potential of the G filter portion becomes 300 V, so less magenta toner adheres in the latter step in step [4']. moreover,
When controlling the amount of cyan toner deposited, for example, [5'
] In step [5'], when the surface potential is set to -50 V and the entire surface is exposed to red light in [3'], the surface potential of the R filter part becomes 450 V. In step [5'], the surface potential is set to Ov. When the entire surface is exposed as [3'], the surface potential of the R filter portion becomes -500V, so more toner adheres to the latter.

As is clear from the above explanation, when at least one of the discharger 61 in [2] and the charger 9 in (5) and (5') is made to have variable charging conditions, the amount of adhesion of each toner is changed. It is possible to change the color balance of the document, obtain a recorded image with high reproducibility of the color balance of the document, and also to emphasize a specific color. Note that the charger 9 can also be used as the discharger 61 as shown later, and its installation can be omitted.

In FIG. 18, it is shown that the potential difference caused by the uniform exposure in (3) and (3') disappears by recharging with the charger 9 in (5) and (5'), but This is a preferable case, and it may not disappear completely. In that case, it is more preferable to remove the static charge using a corona discharger, such as an AC corona discharger, before recharging the developed image, and then perform recharging after the uniformity is achieved.

Further, the potential difference caused by the uniform illumination of the entire surface by each specific light can be arbitrarily adjusted depending on the characteristics of the light source lamp 7, the photoreceptor 4, and the filter, but it is preferable to set it to be substantially the same.

As mentioned above in the explanation of FIG. 18, for the photoreceptor 4 in the state of FIG. The entire surface is exposed to green light obtained by filtering the light from the lamp 7 through a green filter (step [3'] in FIG. 18). As a result, as described in FIG. 17 [3], a potential pattern that provides a complementary color image of green appears in the G filter portion.

When this electrostatic image is developed by a developing device containing magenta toner, the magenta toner adheres only to the G filter portion, forming a magenta toner image as shown in FIG. 17 [4] (see FIG. 18). [4'] process)・. The color balance between this magenta toner image and the previously formed yellow toner image is adjusted by the method described in connection with FIG. The surface of the photoreceptor 4 on which these two-color toner images have been formed is further discharged by the charger 9 in the same manner as in FIG. 17 [5] to make the potential uniform ([5' in FIG. 18]). (Step 3' in Figure 18), the entire surface is exposed to red light obtained by the combination of the lamp 7 and the red filter, and a potential pattern giving a red complementary color image is formed in the R filter portion (Step 3' in Figure 18). ). The conditions for discharging by the charger 9 at this time can also be changed as described with reference to FIG. Therefore, when the electrostatic image in the R film area is developed into a cyan toner image by a developing device containing cyan toner (step [4'] in FIG. 18), a 3. A clear full-color image with excellent density balance of color toner images is formed on the photoreceptor 4. This color image is transferred onto recording paper or the like and fixed by conventionally known means.

Although the above explanation is based on an example in which an n-type optical semiconductor is used for the photoconductive layer 1 of the photoreceptor 4, it is of course possible to use a p-type optical semiconductor such as selenium. In that case, the basic process remains unchanged except that the positive and negative signs of the charges in the above explanation are all reversed.

In any case, if it is difficult to inject charges into the photoreceptor 4 by the charger 5, uniform irradiation with light may also be used.

Table 1 shows the relationship between the □ color in the original image and image formation by the above-mentioned three-color separation method and the combination of three primary color toners.

Symbol r in Table 1: Indicates that a charge exists between the insulating layer and the photoconductive layer of the photoreceptor exposed to pJVi image, and the symbol r
OJ indicates that the surface potential of the photoreceptor changes due to uniform exposure, and the symbol "■" indicates that toner adheres. Also, the symbol "↓" indicates that the state in the upper column is maintained as it is, the blank column indicates an area where light passes through the insulating layer during image exposure and toner does not adhere, and Y in the attached toner column.

1 (, C are yellow toner, magenta toner,
Indicates that cyan toner is attached.

Next, FIGS. 19 to 2 illustrate the method of the present invention described above.
The recording device shown in FIG. 2 will be explained.

1 to 4 or 9.
The photoreceptor 4 having the layer structure shown in FIGS.
The recording apparatus shown in FIGS. 5 and 21 uses the photoreceptor 4 having the layer structure shown in FIGS. 5 to 13, and the recording apparatus shown in FIG. 22 uses the photoreceptor 4 having the layer structure shown in FIGS. is used.

In FIGS. 19 to 22, the same reference numerals as in FIG. 17 indicate the same functional members, FG is a green filter, FR is a red filter, 8M is a developing device containing magenta toner, and 8C is a cyan toner. The stored developing device,
10 is a transfer device that transfers the toner image formed on the photoconductor 4 onto the recording paper P as described with reference to FIG. 17; 11 is a separator that separates the recording paper P onto which the toner image has been transferred from the photoconductor 4; 12 is a fixing device for fixing the toner image onto the recording paper P;
Reference numerals 3 and 14 denote a static eliminator and an exposure device for removing static electricity from the photoreceptor 4 after transfer, and 15 a cleaning device that removes residual toner from the surface of the photoreceptor 4. All of these recording devices are capable of superimposing toner images of up to three colors during one rotation of the photoreceptor 4 (as with conventional multicolor image recording devices, it is possible to superimpose toner images of up to three colors). The process of forming a toner image in these recording apparatuses has already been clarified in the explanation with reference to FIGS. 17 and 18, and the transfer of the formed toner image,
Since the fixing process and the static neutralization and cleaning process of the photoreceptor 4 are the same as those in conventional recording apparatuses, further explanation will be omitted, but in the recording apparatuses shown in FIGS. is separated from the image exposure device 6 and provided on the outer insulating layer side of the belt-shaped photoreceptor 4, and the image exposure device 6 is provided with a mirror 6.
2, image exposure is performed from the side of the light-transmitting conductive layer having the filter layer inside the photoreceptor 4 to the portion to which the discharge device 61 applies discharge. In any recording device, a charger 9 is provided between the discharger 61 and each developing device 8Y to 8C.
By relatively changing the discharge conditions, the color balance of the reproduced multicolor image is adjusted, and by changing the overall density, the overall density is adjusted.

Note that the recording apparatus that implements the method of the present invention is not limited to the above example, and may be one in which toner images of one color are formed and superimposed each time the photoreceptor 4 makes one rotation or one reciprocation. Often, in such a recording device, the charger 9 can be omitted and a discharger 61 can be used to perform discharge at the same time as image exposure. Lamp 7 at the location of the device
It is also possible to omit the full-surface exposure device between the developing devices 8Y to 80 by providing a full-surface exposure device consisting of a combination of switching filters in which filters FB, F, FR are used selectively.

In the present invention, the color reproduction of a multicolor image is adjusted by changing the discharge conditions of the discharger 61 and the charger 9, as described above. An AC or AC corona discharger is used, and the DC discharger is preferably one that can control the voltage or current applied to the discharge wire, and the AC discharger is one that applies an AC voltage containing a DC component to the discharge wire. Alternatively, an AC voltage is applied to the discharge wire and a DC voltage is applied to the plate electrode, and those in which the applied voltage or current can be controlled are preferably used.

In addition, the signal for adjusting the color reproduction of a multicolor image may be sent by the operator of the recording device by operating the volume, etc., or it may be sent automatically from the computer in the recording device by providing a color reproduction detection means. Output method % Formula % Development in the multicolor image forming method of the present invention is preferably carried out by a magnetic brush method. In this case, the developer is a so-called component developer consisting only of toner, or a toner and a magnetic carrier. Any two-component developer can be used. During development, conditions such as direct rubbing with a magnetic brush may be used, but in particular, in order to avoid damage to the toner image formed after the second development, a developing method in which the developer layer does not come into contact with the photoreceptor surface, such as in the United States, is used. Patent No. 3,893,418, Japanese Patent Application Laid-Open No. 18656/1982, Japanese Patent Application No. 58/574
No. 46, Japanese Patent Application No. 58-238295, Japanese Patent Application No. 58-2
Particularly preferred is the method described in each specification of No. 38296. This method uses a non-magnetic component developer that can freely select the coloring or a two-component developer containing non-magnetic toner, forms an alternating electric field in the development area, and eliminates contact between the photoreceptor and the developer layer. , the gap between the photoreceptor surface and the developer layer transport carrier of the developing device is made wider than the layer thickness of the developer layer in the developing area (the layer thickness under the condition that there is no potential difference between the photoreceptor and the developer layer transport carrier). Development is performed under the following conditions.

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. The produced toner for developing electrostatic images can be used, and the carrier can be iron powder, ferrite powder, which are usually used for electrostatic images, resin coatings thereof, or magnetic substances dispersed in toughness. Various known carriers can be used, such as magnetic carriers such as .

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

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

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

〔Effect of the invention〕

According to the present invention, the entire surface charging and image exposure, which conventionally required multiple times, can be carried out in one time.Therefore, color shift does not occur, color balance and density can be easily adjusted, and high The excellent effects of being able to obtain high-quality images and also making it possible to reduce the size, increase the speed, and improve the reliability of multicolor electrophotographic devices are obtained.

[Brief explanation of drawings]

1 to 13 are cross-sectional views schematically showing examples of the laminated structure of the photoreceptor used in the method of the present invention, and FIGS. 14 to 16 are filter layers showing examples of the distribution of color separation filters, respectively. A plan view, FIG. 17 is a process diagram for explaining the multicolor image forming method of the present invention, and FIG. 18 is a photoreceptor for explaining that the color balance can be adjusted by changing the discharge conditions such as recharging. Surface potential change graph, No. 19
20 and 22 are respectively schematic front views showing an example of a recording apparatus implementing the method of the present invention, and FIG. 21 is a schematic side view showing an image exposure portion of the recording apparatus shown in FIG. 1... Photoconductive layer, 2... Insulating layer, 2a...
... Filter layer, R, G, B... Color separation filter, 2b... Transparent insulating layer, 3... Conductive layer, 3a...
... Filter layer, 3b... Transparent layer, 3C... Conductive thin layer, 4... Photoreceptor, 5... Charger,
6... Image side light device, 61... Discharge device,
62...Mirror, 7...Lamp, FB, F, FR...Filter, 8Y, 8
M, 8G - Developing device, 9... Charger,
P...recording paper, 10...transfer device,
11... Separator, 12... Fixing device, 13
... Static eliminator, 14... Exposure device for static elimination, 15...
・Cleaning device. Patent Applicant Roku Konishi Photo Industry Co., Ltd. Figure 44Figure 15Figure 16Figure 19Figure 20Figure 21

Claims (1)

[Claims] A multicolor photoconductive layer having an insulating layer on one side and a conductive layer on the other side, at least one of the insulating layer or the conductive layer being translucent and having a plurality of types of filter distributions. Using a photoreceptor for image formation, the photoreceptor is charged and subjected to image exposure, and then the whole surface is exposed to produce a potential pattern on a specific type of filter portion of the filters on the surface of the insulating layer of the photoreceptor. In a method of forming a multicolor image by repeating development of a potential pattern and recharging before the second and subsequent full-surface exposure, at least one of the charging at the time of image exposure and the conditions for each recharging. A multicolor image forming method characterized in that the color balance of a multicolor image is adjusted by making one variable.