JPS6188266A - Electrophotographic sensitive body, its manufacture and formation of image - Google Patents

Abstract

PURPOSE:To provide high durability and to obtain stably a polychromatic image having high quality by forming a composite filter layer consisting of plural kinds of filters each made of toner particles contg. particles incorporated with a colorant and a transparent resin on a photosensitive layer. CONSTITUTION:The photosensitive layer 2 of an electrophotographic sensitive body is imagewise exposed through a composite filter layer 3 consisting of plural kinds of filters each made of toner particles contg. particles incorporated with a colorant and >=70wt% transparent resin on the photosensitive layer 2, and the layer 2 is uniformly exposed to specified light to form a potential pattern on filter parts corresponding to the light. The potential pattern is developed with an image forming toner. Said uniform exposure and development stages are repeated to form color toner images corresponding to the colors of the filters on the sensitive body. Since the filter layer 3 is formed on the surface of the sensitive body, the adhesive property and wear resistance are improved. The colorant in each of the color filters is protected with the resin, so the filters can be arranged densely in the form of lines A or mosaic B without causing color migration among the filters. a polychromatic image having superior resolving power is obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrophotographic photoreceptor for forming multicolor images using electrophotography, and its Ill! ! Regarding manufacturing methods and image forming methods, it is used in various multicolor image forming apparatuses, color printers, etc.

[Conventional technology]

Conventionally, several methods and apparatuses have been proposed for forming multicolor images using electrophotography.

For example, there is a multicolor image forming method and apparatus (the former) in which each color toner image is formed on an electrophotographic photoreceptor by image exposure and development according to each color separated light and is transferred to recording paper each time. In addition, the flange is equipped with a T-mounted device equipped with multiple photoreceptors according to the number of separated colors.
There is a method and apparatus (the latter) in which each photoreceptor is subjected to image exposure and development of each color to form a toner image of each color and sequentially transferred to recording paper.

[Problem that the invention seeks to solve]

However, in the former case, it takes a long time to record an image because the photoreceptor is rotated multiple times to form each color toner #E.
There are drawbacks such as difficulty in increasing the speed. And what about the latter? Although this method is advantageous in terms of high speed because it uses v number of photoreceptors in parallel, it has drawbacks such as the use of a plurality of photoreceptors, which makes the device larger and more expensive. Furthermore, since transfer is repeated multiple times for both the former and the latter, there is a problem in that it is difficult to align the images.

[Means for solving problems]

The present invention has been made in view of the above-mentioned problems, and is composed of a plurality of types of filter groups formed of toner particles containing particles containing a colorant and preferably 70% by weight or more of a transparent resin on a photosensitive layer. preferably has a resistivity of 10”
The present invention provides a photoreceptor including a composite filter having a resistance of Ωm or more, more preferably 10 13 ΩQn or more, and a method for manufacturing the photoreceptor, which includes a step of adhering the toner particles to a photosensitive layer or a protective layer using static electricity.

According to the photoreceptor having the above structure, since the toner particles have excellent physical properties, when the filter is formed by adhering and fixing the particles to a photosensitive layer or a protective layer, etc., the adhesion and abrasion resistance are excellent. In addition to being superior, the adverse effects of colorants and the like on the photoconductive properties of the photosensitive layer are also eliminated. In addition, since the coloring agent in the filter is sufficiently protected by the resin, there is no color difference between the color filters, and the color filters can be closely arranged in a linear or mosaic pattern. Therefore, a multicolor image with excellent resolution can be formed on the photoreceptor.

In the present invention, the step of subjecting the photoreceptor of the present invention to imagewise exposure 2, and the step of uniformly exposing the photoreceptor to specific light to form a 12-position pattern on each corresponding filter portion, and developing this are repeated. An image forming method is provided. According to this image forming method, it is possible to quickly and easily form a multicolor image with excellent color balance and no brownish shift or the like with only one image exposure.

In the present invention, a plurality of types of filter groups are combined in a linear or mosaic pattern, each of which has sufficient physical properties through the action of a desired amount of binder resin, on a photosensitive layer that is sensitive to at least the entire visible light range. An electrophotographic photoreceptor with a composite filter is used. In order to form a multicolor image using the photoreceptor, for example, the entire surface of the photoreceptor is firstly charged, secondly charged, etc.
Subsequent charging and simultaneous image exposure are performed to form a primary latent image corresponding to the resolved image density on the photosensitive layer below each filter section. 1
The next latent image is latent and no potential pattern is formed on the surface of the photoreceptor. Then, by exposing the entire surface to a specific light, in this case the same color as the light transmitted through the first color separation filter, only the photosensitive layer under the filter of that color corresponds to the intensity of the primary latent image. A secondary subtraction is formed, that is, a potential pattern is formed on the specific type of filter portion (including the filter and the protective layer immediately above the filter, if there is a protective layer on the filter).

This potential pattern is then developed with a toner having a complementary color to that of the filter. Thereafter, by repeating the steps of recharging to smooth the surface potential, full exposure to specific light to form a potential pattern in the next decomposition filter section, and development with toner having a complementary color relationship with that of the filter, the photoreceptor is A multicolor toner image is formed on which toner images of each color are superimposed.

This multicolor toner image is transferred onto the recording paper in only one transfer.

゛Hereinafter, the photoreceptor of the present invention, its manufacturing method, and □W /l/
The formation process will be explained with reference to FIGS. 1 to 3.

FIG. 1 schematically shows a cross section of a photoreceptor according to the present invention. A photosensitive layer 2 is provided on the conductive member 1, and a required color separation filter (a filter that transmits only light having a specific wavelength range) is applied thereon, for example, a red 2, green (0, blue [F]) separation filter. Layer 3 containing a composite filter consisting of a group of
are arranged in a superimposed manner.

s Electrical member l is aluminum, iron, or nickel.

It may be made of a metal such as copper or an alloy thereof, and may have an appropriate shape and structure as necessary, such as a cylindrical shape or an endless belt shape.

e Hikari Jf? 2. Photoconductors made of sulfur, selenium, amorphous silicon, or alloys of these with tellurium, arsenic, antimony, etc., or oxides and iodides of metals such as zinc, aluminum, antimony, bismuth, cadmium, molybdenum, etc. , sulfide, and selenide The photoconductor is formed by vapor deposition or, if necessary, by coating with a resin. Also vinyl carbazole, anthracenephthatercyanine, trinitrofluorenone, polyvinyl carbazole.

It is formed by similarly vapor-depositing or dispersing an organic photoconductor such as polyvinylanthracene, polyvinylpyrene, polycyclic quinone dye, bisazo dye, etc. or by coating after dispersing the resin. Such resins include polyethylene, polyester, polypropylene,
Polystyrene, polyvinyl chloride, polyvinyl acetate,
Polycarbonate, acrylic resin, silicone resin,
Motohiro fat.

Examples include insulating and transparent resins such as epoxy heart fat. It is also possible to use a functionally separated photoconductor that is divided into a charge generation layer and a charge transfer layer.

The layer 3 including the composite filter may be, for example, one consisting only of the composite filter 3a as shown in FIG. 1A, or an intermediate Jti 3b between the composite filter 3a and the photosensitive layer 2 as shown in FIG.
There is a structure in which a protective layer 3c is provided outside the intermediate layer 3b as shown in FIG. 1C, and a composite 7t router 3a is sandwiched between the two layers. Alternatively, as shown in the first diagram, a composite filter 3a may be provided directly on the photosensitive layer 2, and a protective layer 3c may be provided thereon.

The composite filter 3a may be made of only a high-resistance coloring agent, but in general, a high-resistance colorant is often applied by hand, so it is preferably made of a resin of the same type as the binder resin of the photosensitive layer 2. 70% by weight or more of resin and less than % shotgun, preferably 2% by weight
It is formed using a toner containing the above colorant. Such colorants include, for example, (1, copper phthalocyanine, methylene blue, cyanine blue) for blue separation filters.

Organic dyes and pigments such as Victoria Blue, Neozapon Blue, and Oil Blue are used. Also, for green filters,
For example, organic dyes and pigments such as brilliant black, malachite green, and naphthol green are used. For red filters, for example, fuchsin, phenosafranin, rotamine B.

Organic dyes and pigments such as naphthol red and neozapon blue are used.

It consists only of the composite filter 3a, or it further includes an intermediate layer 3.
There are various ways to form the layer 3 (having the protective layer 3B and/or the protective layer 3C) on the photosensitive layer 2 as described below.

(2) For example, as shown in FIG. 1, the photosensitive layer 21 is provided with a filler to prevent developer, adhesive, etc. from entering the pinholes of the photosensitive layer, if necessary. : When the composite filter 3a is provided, a uniform electrostatic charge is applied in advance to the light layer 2. Among the linear, mosaic, or dot-shaped multicolor Fα pattern, for example, a blue color is used. .

A written electrostatic charge image is formed by imagewise exposing the original for the cut pattern. This electrostatic charge image is reversely developed with a blue toner to form a blue toner image, which is fixed on the photosensitive layer by pressure or rotational heating. Next, a green toner image is formed by image exposure of the document for the green dot pattern and reversal development of the green toner, and then this is fixed. Finally, a red toner image is formed and fixed by, for example, image exposure of a red dot-turning document and reversal development of the red toner. In this way, a composite filter 3a is formed in the five-light layer 2, which is composed of a group of three color separation filters: blue (1), green (0), and red (2). As the writing method using image exposure, for example, a halftone original may be exposed in close contact, or an optical system may be used to form an image. Further, writing may be performed using a laser beam controlled based on document information or a light emitting diode (LED) driven based on document information. Also, multicolor originals [F]),
(5) Each color component may be extracted and exposed through a filter that transmits only each component. A protective layer is further formed on the photosensitive layer 2 formed on the composite filter 33.
3c can also be formed by adhesion or lamination.

■ For example, as shown in Figure 1B, please prepare the protective layer film 3C in advance.
If a composite filter 3a is formed on the surface of the composite filter 3a, and the composite filter 3a is glued or laminated onto the photosensitive layer 2 with the filter side facing down, for example, write a dot turn for each color separation filter on the electrostatic record based on the original information, and The developing and fixing process is then repeated to form a composite filter on the film 3C.

■ For example, as shown in FIG. 1C, an intermediate layer 3b is provided on the photosensitive layer 2, a composite filter is formed thereon, and a protective layer 3C
In the case of providing the intermediate layer 3b, either the electrophotographic method (for example, NP method) or the electrostatic recording method of the deposit fln (1) may be used for the intermediate layer 3b.

In each of the methods described in items 1 to 0 described above, when performing powder development using the magnetic brush method, the non-contact developing method (
The distance between the photosensitive layer and the developing sleeve is set to be larger than the thickness of the developer on the developing sleeve.

(However, if the potential difference between the two is 0), it is not necessary to perform fixing every time each color separation filter is formed, and the process can be made more compact because it can be fixed all at once after the final development is completed. There is. Furthermore, from the point of view of the resolving power of the composite filter, it is preferable to adopt the liquid jJ/Q method since it is relatively possible to use fine particles.

In the photoreceptor of the present invention, when a composite filter is formed on the photosensitive layer using an electrophotographic method, or when it is formed by development using a >y-type developing agent, it is necessary to seal the photosensitive layer 2 times before the photosensitive layer is formed. Furthermore, it is advantageous to form the photosensitive layer using a thermosetting or photocurable resin.

In forming the composite filter of the present invention, the liquid developer used is prepared by dissolving the above-described toner colorant and binder resin in an appropriate amount of an organic solvent.
For example, those dispersed in the form of fine particles in an isoparaffinic solvent are used.

The shape and arrangement of the minute color separation filters of several colors that borrow the composite filter are not particularly limited, but they may have a linear shape as shown in FIG. 2A, for example, if the photoreceptor is a drum , lines perpendicular to the direction of rotation, lines parallel to the direction of rotation, etc. Can be used.

However, when purchased in mosaic form such as No. 2i9B and C, the size of each filter is preferably 500 ttm as the repeating width (l in FIG. 2). If the size of the filter is too small, it will be easily affected by adjacent parts of other colors, and if the width of one filter is equal to or smaller than the particle size of the toner particles, it will be difficult to create. Become. Furthermore, if the size of the filter becomes too large, the resolution and color mixing properties of the image will decrease, resulting in deterioration of the image quality.

In addition, Fig. 1 A to C and Fig. 2 A to C are all red.
A case is shown in which a so-called three-color separation filter for blue is provided. In the figure, R indicates a red filter, G indicates a filter, and B indicates a blue filter.

Next, the process of forming a multicolor image using the photoreceptor of the present invention will be explained. Figures 3 [1] to [8] schematically represent the first process of extracting a part of a photoreceptor using an n-type semiconductor such as cadmium sulfide as the photosensitive layer and forming an image there. . In the figure, 1 and 2 are a conductive member and an r3 optical layer, respectively, as in FIG. 1, and 3 is B, G
, R3 color composite filter? This is a layer containing Further, the graphs at the bottom of each figure in FIG. 3 show the potentials on the surface of each part of the photoreceptor.

First, charge n41. : Therefore, when a positive corona discharge is applied to the entire surface, a positive charge is generated on the surface of the layer 3 including the composite filter,
Correspondingly, a negative charge is induced at the interface between the photosensitive layer 2 and the layer 3, resulting in the state shown in FIG. 3 [1].

Next, an alternating current or negative discharge 2 is applied by a charger 5 equipped with an exposure slit to erase the charge on the surface of the layer 3 while exposing the image from the multicolor original. In this image exposure, the color balance is adjusted by inserting a filter into the chamber in consideration of the spectral characteristics of the layer 3 including the light source and the composite filter, the spectral sensitivity of the photoreceptor, and the like.

In the photoreceptor of the present invention, image formation is performed by exposing multicolor images of red, green, and blue as described above, but for the sake of clarity, the image formation process will be explained using an example of an original having only a red image. do.

FIG. 3 [2] shows the state of the portion subjected to image exposure (arrow) from the red image. The red light Lr passes through the region 3RE that includes the #53 red separation filter section, and in order to make the photosensitive layer 2 below it conductive, most of the positive charges on the layer 3 are erased. The negative charges induced in the photosensitive layer 2 are also erased, and the surface potential becomes close to zero potential.

On the other hand, the green and blue separation filter section 3G.

3B does not transmit red light Lr, so some of the positive charges on layer 3 are erased, but the negative charges in photosensitive layer 2 remain as they are, and correspond to the partially erased positive charges. A charge is induced in the conductive member 1 . In such a charge distribution, the surface potential on the green and blue separation filter sections 3G and 3B is zero, 717. It will be close to that. Therefore, although the composite filter contains charges F and Kk as a first-order latent image, it cannot form a toner image because there is no surface potential difference. by controlling the grid voltage using −
A uniform surface potential of 200V or the like may be used. Next, a specific light that causes a potential pattern only in one type of decomposition filter in the layer 3, for example, the light source 6 and the blue filter FB.
The entire surface is exposed to blue light (arrow LB) obtained by . In this case, part of the negative charges on the photosensitive layer 2 at the lower part of the decomposition filter 3B that transmits the blue light LB'E and the positive charges on the conductive member I are neutralized, so that the decomposition filter 3B as shown in FIG.
Positive and negative charges remain between the layer 3 and the photosensitive layer 2 corresponding to the portion 2, and a positive surface potential is given to the layer 3. Negative yellow toner T as shown in Figure 3 [4].

A yellow toner image is formed on the upper part of the separation filter 3B by developing it with the developer 7 carrying the toner. Separation filter 3B on which this yellow toner image is formed
As shown in the lower graph, since the 12th position on the surface of the area corresponding to 12 remains unsaturated with toner, as shown in the lower graph,
A relatively high surface potential remains, leaving room for additional toner to adhere during the next step of development.

Therefore, the surface of the layer 3 is recharged with alternating current or negative direct current, preferably with a negative corona discharge using a scorotron band stimulator 8, to achieve a flat surface potential as shown in the lower graph of FIG. 3 [5]. The surface potential is returned to , preferably equal to the surface potential shown in FIG. 3 [2].

Next, the third [
6:], the negative charges in the photosensitive layer 2 and the positive charges in the conductive member 1 are neutralized, and a high surface potential in the lower graph is obtained in the region 3G of the layer 3. A magenta toner image is obtained in the 3G region by developing this with the developing device 9 carrying the magenta toner TM shown in FIG. 3 [7]. Next, after recharging (FIG. 3 [81)], the entire surface is exposed 2 with red light obtained by the red filter PR, but at this time no potential pattern is generated and development with the cyan toner To is not performed. When the yellow toner image and magenta toner image are thus transferred and fixed onto the recording paper, a red image in which yellow and magenta are superimposed is visually observed on the recording paper.

The above explanation is based on the case where the original is a red image, but the same applies to the case where the original is a white, green, blue, yellow, magenta, cyan, or black image. Color reproduction is achieved through combinations. FIG. 4 is a chart explaining the process of color reproduction when each color IGj T ('j+) is used. In FIG. 4, the horizontal axis represents the color tone of the original, and the vertical axis represents the color tone when using each color original. It represents the process of each stage leading to toner image formation.The symbol rC::J represents the formation of a primary latent image, the symbol rOJ represents the formation of a secondary latent image, and the symbol "[phase]" represents the process of each stage of toner image formation. The symbol "↓" indicates that the state in the upper column is maintained as it is, and the blank column indicates a portion where latent image formation is not performed.

In the above explanation, an n-type semiconductor is used as the photoreceptor, but a photoreceptor using a p-type semiconductor such as selenium may also be used. There is no change. Of course, if the photoreceptor can be used for both n-type and p-type, either type may be used.

[Effect]

As is clear from the above description, the photoreceptor of the present invention is produced by forming a primary latent image on a photosensitive layer by electrophotography or electrostatic recording. After forming the image, a secondary latent image is formed for each color of the color separation filter that forms the grooves of the composite filter by exposing the entire surface using the three-color separation method, which is then exposed with toner of the corresponding color and recharged. This process was repeated to obtain a multicolored house.

The layer containing the composite filter may be used alone or may have a protective layer made of an insulating film, and the layer containing the composite filter usually has a thickness of 10 to 100 μm, preferably 1 to 1 μm. The composite filter also contains 7 as a binder.
It contains 0% by weight or more of a transparent resin and an organic dye or pigment soluble in an organic solvent, less than 30% by weight and 2% by weight or more, preferably 5 to 500 μg per unit area. In addition, a plasticizer may be added to improve the processability of the composite filter, and an ultraviolet absorber such as Tinuvin may be added to prevent the colorant from fracturing due to ultraviolet rays.

As the photosensitive layer on which the composite filter is placed, any photosensitive layer that is commonly used in electrophotography can be used; When using a photosensitive layer consisting of dispersed "C", the following treatment is required.
A filler m3 is provided to close the unevenness and holes existing in the photoreceptor to prevent deterioration of the photoconductive properties due to infiltration of toner particles, liquid developer, etc., and a composite filter is formed thereon. Or, by forming a composite filter on the protective layer in advance,
The filter is formed by adhering to the sealed surface of the photosensitive layer with the filter surface facing down. Further, as the resin forming the photosensitive layer, for example, heat or photo-curable acrylic resin, silicone resin, polyamide resin, melamine resin, incyanate resin, cinnamic acid resin, etc. are used to make the photosensitive layer insoluble in solvents. Good.

Next, the composite filter is planned using a photoreceptor with multiple colors.
The so-called NP method, which utilizes the charges induced in the photosensitive layer as described above, is used as a method for forming the Iill image. Recharging is required to remove damage caused by image residue.

This recharging is usually performed by a negative DC discharge using a scorotron charger.

〔Example〕

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

(Example 1) FIG. 5 shows blue and green for explaining this embodiment.

A multicolor manuscript consisting of the three primary colors of red? FIG. 1 is a sectional view of main parts of a multicolor image forming apparatus that performs quick copying. 10 is a photoreceptor, 11 is a positive DC-forming charger, 12 is a negative DC corona discharge scorotron charger having a slit for image exposure, and 13B is a light source that includes a blue filter F and irradiates blue light LB. , 14Y
is a developing device containing yellow toner. 15 is a sufrotron charger for negative DC corona discharge; 16G is a light source that has a green filter FG and emits exhaustion light LG; 17
M is a developing device containing magenta toner, 18 is a sufrotron charger for negative DC corona discharge, 19R is a light source having a red filter FRP and irradiating red light LR, and K is a developing device containing cyan toner. P is the recording paper, 21 is the transfer electrode, n is the separation electrode, and the feather is 1! A static eliminator for removing residual charges that removes static electricity while exposing white light from the very back side, and a cleaning blade for removing residual toner.

Next, as the photoreceptor 10, a photosensitive liquid containing a fraction of 100 parts by weight of cadmium sulfide in 40 parts by weight of a thermosetting silicon-modified acrylic resin and 100 ml of toluene was spray-coated on an aluminum base drum, and the layer thickness was adjusted to μ. A photosensitive layer was formed, and the photosensitive layer was sealed with a thermosetting acrylic resin to a thickness of 0.5 μm. Next, on the photosensitive layer, toners of the following three primary colors were used to form a 10 μm thick mosaic, strip-like composite filter (l) as shown in FIG. 2B.
= 150 μrrL) was formed by electrophotography.

This composite filter has an additional 5 μm J? A resin layer of - was applied.

[However, Victoria Blue (blue) is used as a coloring agent.

Malachite green (green) and rhodamine B (red) were used. ] After thoroughly mixing the ingredients of the above formulation using a ball mill, heat kneading using a kneading machine, cooling, and pulverizing to give an average particle size of 5 μm.
This toner was then treated with hot air using a spray dryer to make it spherical. This toner was mixed with a carrier (toner particles %) consisting of particles in which fine magnetite particles having an average particle diameter of 1 μm were dispersed in a resin to a concentration of 70 μm to prepare a developer for reversal development. The current method for forming a composite filter using such a developer is disclosed in Japanese Patent Application No. 58-184 filed earlier by the present applicant.
No. 381, Patent Application No. 183152, Patent Application No. 1983-
187000, Japanese Patent Application No. 58-187001, and Japanese Patent Application No. 58-238296, the gap between the developing sleeve and the photosensitive layer is made larger than the developer layer on the developing sleeve. It is better to use the current setting (provided there is no potential difference between the two).

Next, a more specific method for forming a 10 μm thick mosaic filter using the electrophotographic method will be described below. First, the drum having the cadmium sulfide photosensitive layer is rotatably installed, and while the drum is rotated, a uniform negative charge is applied, and then a helium-neon laser beam having a dot diameter of 1 μm is applied (Fig. 2B). Dot exposure is performed at a position corresponding to the stomach filter portion (3d in the first diagram) so as to form the filter shown in FIG. Next, using the developing method described in each of the above-mentioned specifications, the blue toner of the above prescription is adhered to the dot-exposed area by reversal development. Next, if necessary, charge is removed and the first pattern is erased, then recharged and the position corresponding to the green filter section (
3d2) of the first drawing is subjected to dot exposure, and the green toner of the above prescription is attached.

Next, recharging is performed again, and three dot exposures are performed at the position corresponding to the red filter portion (3d in the first diagram) to deposit the red toner of the above prescription. In this way, a composite filter consisting of a toner image is formed on the photosensitive layer.

The toner is then fixed onto the photosensitive layer by heat, solvent, pressure, or a combination thereof. In this fixing, it is preferable to use both heat and pressure for smoothing. For example, under pressure 10
It is preferable to use a hot roll fixing method at 0° C. or lower, which does not deteriorate the light guiding properties of the photosensitive layer.

A process for forming multiple repeated images using the copying apparatus shown in FIG. 5 having the photoreceptor 10t having the composite filter formed as described above will be described.

The photoreceptor 10 configured as described above is first given a uniform positive charge by the charger 11, and then the AC charger 12 is applied, and at the same time, the image exposure from the original of the three primary colors of blue, green, and red is scanned. A primary latent image corresponding to the intensity of image exposure was formed for each color separation filter of the composite filter. Next, the entire surface is exposed L by a white light source 13B equipped with a blue filter FB.
B is applied, and a secondary latent image having a τL potential pattern corresponding to the primary latent image is formed in the region of the blue separation filter,
This secondary latent image was developed by the yellow developing device 14Y to form a yellow toner image.

Next, the entire surface is exposed to white light S 16 G + equipped with a trailing edge color filter F in which static charges remaining in the region of the nQ blue separation filter are erased by a negative scorotron charger 15 . was applied, and developed with a magenta developing device 17N, to form a magenta toner image that overlapped with the yellow toner image.

Next, after erasing the remaining potential pattern with a negative scorotron charger 18, the entire surface is exposed LR by a white light source 19R equipped with a red filter FR, and developed by a cyan developer to form a cyan toner image. Ta. In this way, a multicolor toner image corresponding to the original is formed on the photoreceptor, and is transferred to the recording paper P fed at timing 3 by the action of the transfer electrode 21, and separated by the action of the decomposition electrode n. , and 1 were fixed by a fixing device not shown. On the other hand, after the transfer, the photoreceptor 10 is neutralized by a static eliminator B, and then
A cleaning blade cleaned the residual toner and prepared it for the next image formation.

The development in the present invention is preferably carried out by a magnetic brush method, and the developer can be used with either a so-called one-component developer using magnetic toner or a so-called two-component developer using a mixture of toner and a magnetic carrier such as iron powder. can. For development, direct rubbing with a magnetic brush may be used, but in order to avoid damage to the formed toner image, especially after the second development, a developing method in which the developer layer does not come into contact with the photoreceptor surface (developing sleeve and A developing method in which the gap between the photoreceptor and the developing sleeve is set to be larger than the thickness of the developer layer on the developing sleeve (provided there is no potential difference between the two), for example, US Patent No. 3.
Specification No. 893.418, Japanese Unexamined Patent Publication No. 18656/1983, Japanese Patent Application No. 57446/1982, Japanese Patent Application No. 2382/1983
It is particularly preferable to use the methods described in Patent No. 95 and Patent FPj58-238296. In this method, an alternating electric field is formed in the development area using a two-component developer containing only a non-magnetic toner and a non-magnetic toner, which can be colored freely. A developer that performs development without contacting the developer layer is preferred, but a developer using magnetic toner may also be used.

The color toner used for development is prepared using known techniques, consisting of a known binding resin commonly used in toners, various chromatic colors such as organic and inorganic pigments and dyes, colorants for fP coloring, and magnetic additives for each scale. 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 tree manure with magnetic additives. 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.

(Actual! Fabric Example 2) A potential pattern was formed on the photosensitive layer in the same manner as in Example 1, and this was developed with a liquid developer having the following formulation to a temperature of approximately
B and G show the heat roll fixing process.

The process was repeated for each color of R to form a composite filter.

Toner images obtained using liquid developers can be easily fixed by heating, but do not have sufficient film strength. Therefore, in the present invention, a shrinkable tube of ημm) V- is made of a polyethylene terephthalate film on top of the shrinkable tube. After covering, the tube was left at 110°C for 15 minutes, and the ft1l tube was placed in close contact, and an insulating layer of m thickness was formed.
I decided to use a composite filter.

liquid developer formulation [However, Victoria Blue (1) is used as a coloring agent.

Brilliant green (green) and phenosafranin (red) were used. Note that the liquid developer was prepared by first sufficiently dissolving an acrylic resin, a colorant, and a charge control agent in a dioxane solvent, and then dispersing the resulting solution into fine particles in an Isopar H solvent.

When three color images were formed using the photoreceptor 10 in the same manner as in Example 1, a high quality recorded image was obtained with no color shift.

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 also be arbitrarily selected depending on the purpose.

Note that "charging" as used in the present invention includes cases where the surface potential obtained when charging becomes 0 or where the surface charge disappears. In addition, in the above explanation, the spectral characteristics of the light for full-surface exposure are obtained by using filters with blue, green (0, and red openings), but they may also be obtained by means other than filters, and the spectral characteristics may also be G,B
, H. In short, any spectral characteristic is sufficient as long as it forms a potential pattern only on a specific filter portion on the photoreceptor corresponding to the specific light by exposing the entire surface to the specific light. Therefore, "multiple types of filters" as used in the present invention means:
The photoreceptor may have a layer consisting of a single type of color separation filter (a filter that transmits light only in a specific wavelength range) and a portion without a filter (which may be transparent resin, air, etc.). The portion without this filter is regarded as a transparent filter, and is included in the above-mentioned "multiple types of filters". In this case, the transparent filter is preferably made of toner particles that do not contain colorants and transmit all visible light.

〔Effect of the invention〕

As is clear from the above description, the photoreceptor of the present invention is a photoreceptor having a composite filter with excellent wear resistance, moisture resistance, adhesiveness, electrical properties, etc. Advantages include that the photoreceptor for multi-color image formation can be made stable and durable for long-term use without such damage, and that composite filters can be prepared extremely easily using known electrostatic recording methods or electrophotographic methods. There is. Furthermore, when an image is formed using a photoreceptor that bends, the image quality is extremely high, there is no need to align each color toner image during transfer, and the image forming apparatus can be made smaller, faster, and more reliable. It can be measured.

[Brief explanation of the drawing]

FIGS. 1A to 1C are cross-sectional views of the photoreceptor according to the present invention, FIGS. 2A to C are arrangement diagrams of each color separation filter constituting a composite filter, and FIG. 3 explains the image forming process from a red original. 4 is a chart explaining the image forming process from various colored images, and FIG. 5 is a cross-sectional view of the main parts of the multicolor image forming apparatus of the embodiment. 0 1... Conductive member 2... Photosensitive layer 3...Layer containing a composite filter 4.1]...Positive corona charger 5.12...AC charging and image exposure device 10...Photoreceptor 7.9.14Y, 17M, 20C ...Developer 6, 1
3B, 16G, 19R...Full surface exposure device 21...
・Transfer electrode ρ... Separation electric frame... Static eliminator
12...Cleaning Blade Agent Patent Attorney No 1) Father-in-law [1] [4] Fig. 3 [2] Easy [3] No. [5] [8] Fig. 3 L6], 7 U8

Claims (19)

[Claims] (1) It is characterized by having a layer containing a composite filter including particles containing a colorant and a transparent resin and composed of a plurality of types of filter groups formed by toner particles used for developing a potential pattern. Electrophotographic photoreceptor. (2) The electrophotographic photoreceptor according to claim 1, wherein the composite filter has high resistance. (3) The electrophotographic photoreceptor according to claim 1 or 2, wherein the composite filter contains 70% by weight or more of the resin. (4) The electrophotographic photoreceptor according to any one of items 1 to 3, wherein the layer containing the composite filter is composed only of the composite filter. (5) Claims 1 to 3, wherein the layer containing the composite filter is composed of the composite filter and a protective layer.
The electrophotographic photoreceptor described in . (6) The electrophotographic photoreceptor according to any one of claims 1 to 6, wherein the composite filter has a specific resistance of 10^9 Ωcm or more. (7) The thickness of the layer containing the composite filter is 10 to 1
The electrophotographic photoreceptor according to any one of claims 1 to 6, wherein the electrophotographic photoreceptor has a diameter of 00 μm. (8) A step of attaching toner particles containing particles containing a colorant and a transparent resin to a photosensitive layer or a protective layer using static electricity, and forming a composite filter on the photosensitive layer through this step. A method for manufacturing an electrophotographic photoreceptor. (9) The method for manufacturing an electrophotographic photoreceptor according to claim 8, wherein the step is a step of attaching a plurality of types of toner particles containing a colorant and a transparent resin. (10) The electronic device according to claim 8, wherein the step is a step of adhering at least one kind of toner particles containing a colorant and a transparent resin to toner particles containing a transparent resin and no colorant. A method for manufacturing a photographic photoreceptor. (11) The method for manufacturing an electrophotographic photoreceptor according to any one of claims 8 to 10, wherein the composite filter is composed of a plurality of filter groups and has a specific resistance of 10^9 Ωcm or more. (12) The method for manufacturing an electrophotographic photoreceptor according to any one of claims 8 to 11, wherein the composite filter contains 70% by weight or more of the resin. (13) The method for manufacturing an electrophotographic photoreceptor according to any one of claims 8 to 12, wherein the layer containing the composite filter has a thickness of 10 to 100 μm. (14) The method for manufacturing an electrophotographic photoreceptor according to any one of claims 8 to 13, wherein the composite filter is formed on a photosensitive layer that is sealed if necessary. (15) the composite filter is formed on the protective layer;
The method for manufacturing an electrophotographic photoreceptor according to any one of claims 8 to 13, wherein the protective layer is placed on the photosensitive layer, which is sealed if necessary, with the filter surface facing down. (16) The method for manufacturing an electrophotographic photoreceptor according to claim 8, wherein the composite filter is formed by a liquid development method. (17) Imagewise exposing the photosensitive layer through a composite filter composed of a plurality of filter groups formed of toner particles containing particles containing a colorant and a transparent resin;
An image forming method comprising the steps of repeating the steps of uniformly exposing specific light to form a potential pattern on each corresponding filter portion, and developing the potential pattern with an image forming toner. (18) The method for forming both images according to claim 17, wherein the composite filter contains the resin in an amount of 70% by weight or more. (19) The image forming method according to claim 17, wherein the repeating step forms toner images of the same number of colors as the number of filters on the photoreceptor in a superimposed manner.