JPS62266545A - Photosensitive body - Google Patents

Abstract

PURPOSE:To enable the relatively easy adhesion especially of a filter layer of the photosensitive layer of a photosensitive body and to improve the insulation by forming a color separation layer as the filter layer on the photosensitive body with an epoxy resin adhesive in-between. CONSTITUTION:A layer having a color separation function (a color separation layer or a member for color separation) is adhered to upper side and/or lower side of a photosensitive layer with an epoxy resin adhesive. A photosensitive body 40 has a photosensitive layer 12 formed on an electrically conductive member 11 and a layer 3 composed of a composite filter layer 3a consisting of a group of necessary minute color separation filters and a thin film 3b, and adhered to the surface of the layer 12 with an epoxy resin adhesive 2. The preferred thickness of the adhesive is about 1mum in case where the filter layer is adhered to the photosensitive layer. When such a photosensitive body is produced, a filter layer provided on a transparent thin film formed on a support with an adhesive layer in-between is stripped together with the thin film from the support, then the thin film having the filter layer is adhered to one side of a photosensitive layer with the adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a photoreceptor, particularly an electrophotographic photoreceptor.

BACKGROUND OF THE INVENTION In the past, several methods and apparatus have been proposed for forming multicolor images using electrophotography.

For example, there is a multicolor image forming method and apparatus in which each time a toner image of each color is formed on an electrophotographic photoreceptor by image exposure and development according to each color separated light, the toner image is transferred to a transfer material. For example, using a device equipped with a plurality of photoconductors corresponding to the number of separated colors, each photoconductor is subjected to image exposure and development of each color to form a toner image of each color, and this is sequentially transferred to a transfer material. There are methods and devices for transferring.

However, in the former method and apparatus, since the photoreceptor is rotated multiple times to form toner images of each color, it takes a long time to record an image, and it is difficult to increase the speed. The latter method and apparatus use a plurality of photoreceptors in parallel, which is advantageous in terms of high speed, but has drawbacks such as the apparatus becoming larger and more expensive. Furthermore, in both the former and the latter, transfer is repeated multiple times, making it difficult to align the images.

As a solution to these shortcomings, a patent application filed in 1986-18
No. 5440, No. 59-187044, No. 59-199
No. 547, specification No. 60-229524, etc.,
A composite filter layer in which multiple types of microfilters of different colors are arranged in a mosaic pattern is provided above the photosensitive layer (the side to which toner adheres during development) or below (the side to which toner does not adhere during development) the photosensitive layer. An image forming method using a photoreceptor has been proposed. According to this method, after image exposure is applied through a composite filter bonded to the photoreceptor, the entire surface is exposed to specific light, and the light transmitted through the filter is applied to a portion of the composite filter corresponding to the specific filter. The process of forming a corresponding electrostatic image, developing it using toner of a specific color, and smoothing it by recharging is repeated for each type of filter to form a multicolor image on the photoreceptor. It has the advantage of requiring only one exposure and no need for alignment, making it possible to easily obtain high-quality multicolor images.

C.9 Problems to be Solved by the Invention Although the method of using a photoreceptor having a mosaic filter has many advantages as described above, a major problem is how to provide the filter on the photoreceptor. In other words, simply printing a filter layer on the surface of the photoreceptor, which is relatively fragile but must be extremely smooth and completely free of defects such as scratches, will not produce good results, and it is difficult to achieve technical results. It was also accompanied by many difficulties.

On the other hand, a method of forming an image using a photoreceptor having an insulating layer attached to the surface of the photoreceptor is a well-known image forming method. In the photoreceptor used in this image forming method, the main agent E of a polyester film laminating adhesive manufactured by Dainippon Ink and Chemicals Co., Ltd. is used for adhesion between the photoreceptor and the insulating layer.
An adhesive is used in which PS-623 and hardening agent KN-40 are mixed in a ratio of 5=1 and further diluted to 2 times with methyl ethyl ketone (Japanese Patent Application Laid-Open No. 16645/1983).

One idea is to use such an adhesive to adhere a mosaic filter, which is the color separation filter described above, onto the photosensitive layer, but the results are not satisfactory.

That is, the adhesive used is required to have the following various performances, but an adhesive that satisfies these has not yet been proposed (the mosaic filter is made of an insulating film such as polyethylene terephthalate).

(1) The adhesion layer (adhesive layer) between the photoreceptor and the color separation member (mosaic filter) is uniform.

(2) The aggregation rate at the time of curing is small (if it is large, air bubbles will be generated and the image in this area will be sloppy).

(3) Use an adhesive that does not allow water to escape during curing. Further, in the case of a water-soluble adhesive, the potential of the surface layer of the photoreceptor flows, which is disadvantageous.

(4) If there are any adhesives (including curing agents) that may dissolve or contaminate the photoreceptor and color separation member, it is preferable to avoid them.

(5) It is better not to involve heating during adhesion (for example, if the photosensitive layer is made of amorphous selenium, it is likely to crystallize)
.

(6) The adhesive should be highly transparent to white light and infrared light (as this would lead to a decrease in image exposure).

(7) A material with high insulating properties is better (if it is conductive, charge will flow and the image will become blurred).

26. OBJECTS OF THE INVENTION It is an object of the present invention to provide a photoreceptor to which color separation members (layers) are adhered using an adhesive that satisfies the above-mentioned various performances.

E1 Structure of the invention and its effects, that is, the present invention provides that a layer having a color separation function (hereinafter referred to as a color separation layer or a color separation member) is made of epoxy resin above and/or below a photosensitive layer. This relates to a photoreceptor that is bonded via an adhesive.

According to the present invention, a specific adhesive, ie, an epoxy resin adhesive (hereinafter referred to as the adhesive of the present invention) is used for adhering the color separation layer (in particular, the color separation member such as the mosaic filter described above).

), but this adhesive is fully reactive and does not release volatile substances during curing, so it does not require special pressure for curing. It also has the characteristic of extremely small shrinkage. A bond obtained with proper adhesion is bubble-free and has no residual stress. Epoxy adhesives are suitable adhesives for attaching thin films with filter layers to photoreceptors because they do not release volatile substances during curing.

In this way, by providing the color separation layer on the photoreceptor via an adhesive, the photoreceptor layer and filter layer can be attached relatively easily, and since a polymer is used, the insulation properties are improved. expensive. In addition, since the polymer, solvent, and curing agent can be selected relatively freely, one can choose one that will not contaminate the photoreceptor or filter layer. Similarly, the emission spectrum of image exposure (main wavelength 4
50 nm, 550 nm, 650 nm, etc.) can be selected. When using a water-insoluble adhesive,
It is considered that the amount of charge trapped at the interface between the photosensitive layer and the adhesive layer is higher than that when the interface does not involve the adhesive layer. In addition to serving to bond the photosensitive layer and filter layer, it also protects the photosensitive layer.

The thickness of the initial adhesive is preferably about 1 micron when bonding the photosensitive layer and the filter layer.

When the thickness of the adhesive layer increases, image blurring occurs in that area and image contrast decreases.

When manufacturing the photoreceptor of the present invention, it is desirable to employ a manufacturing method that can easily and efficiently manufacture a photoreceptor that has a filter layer that has excellent abrasion resistance and does not impair conductive properties. Such a manufacturing method includes a step of providing a filter layer on a transparent thin film provided on a support via an adhesive layer, a step of peeling off the thin film from the support, and a step of removing the thin film containing the filter layer from the photosensitive layer. This process includes the step of bonding the upper or lower side with the adhesive of the present invention.

As the support used in this method, film-like webs having appropriate hardness and flexibility, such as various plastic films such as polyethylene terephthalate, polycarbonate, polystyrene, polyethylene, and F-lyacetate, are preferably used. . The thickness of these supports varies depending on the properties of the material, but is 100A!
It is preferable to set it to about m.

An adhesive layer is provided between the support and the thin film that forms the filter layer to temporarily adhere the two, but the adhesive layer is not particularly limited, and various known adhesives can be used. , an adhesive can be used.

The thin film may be constructed using a plastic material similar to that of the support, and its thickness is not particularly limited, but may be as long as it can be handled as an independent film when it is peeled off from the support. It is desirable that the thickness be as thin as possible within the range of strength, and in practice it is preferably 5 to 100 μm thick. Moreover, when the thin film is provided on the photosensitive layer, 10
Although it is preferable to have a specific resistance value of 13 Ω-am or more, no particular limitation is required when it is provided below the photosensitive layer.

The support and/or thin film can also be treated with a Teflon coat or the like in order to adjust the releasability from the adhesive layer. In other words, if the adhesion between the thin film and the adhesive layer is made higher than the adhesion between the adhesive layer and the support, the adhesive layer will adhere to the thin film side and peel off when peeled off, and if the relationship of adhesion strength is reversed, , the adhesive layer remains on the support side, resulting in a thin film without an adhesive layer. In the former case, the adhesive layer may be formed from the adhesive of the invention described above.

FIG. 2 is a diagram schematically showing a cross section of a support having a thin film as described above, in which 1 is the support, 2 is an adhesive layer, and 3b is a thin film.

Then, a filter layer (color separation layer or color separation member) is provided on the thin film surface provided on the support.

The filter layer can be formed by printing directly on the thin film using an ink containing a coloring agent having a desired color and a transparent resin (preferably a hardening resin that hardens with heat or light, etc.), or by printing directly on the thin film, or using a photoresist. Although a method of forming a filter layer with a desired pattern using the above technique is preferred, various other methods such as a method of thermally transferring a colorant can be used.

When forming the filter layer by printing or photoresist techniques, the ink may be post-treated with heat- or photocurable acrylic resins, silicone resins, polyamide resins, melamine resins, isocyanate resins, cinnamic acid resins, etc. as binder resins. Preferably, the material is insoluble in solvents, and contains 70% or more of resin and less than 30% by weight, preferably 2% by weight or more of an organic dye or pigment soluble in organic solvents as a coloring agent. It is preferable to form. As such a coloring agent, for example, organic dyes or pigments such as copper phthalocyanine, methylene blue, cyanine blue, Victoria blue, etc. are used for blue filters. Organic dyes and pigments such as brilliant green, malachite green, and naphthol green are used for green filters, and organic dyes and pigments such as tsukusin, phenosafranin, rhodamine B, and naphthol red are used for red filters. Further, a plasticizer to improve the processability of the filter layer, and an ultraviolet absorber such as Tinuvin (trade name manufactured by Ciba Corporation) to prevent the colorant from fading due to ultraviolet rays may be added.

To form a filter layer on the thin film, an ink prepared by dissolving the colorant and curable binder resin in an organic solvent such as toluene, benzene, ethyl acetate, methyl ethyl ketone, or acetone is used to form an offset or gravure layer. A filter is provided using a printing technique such as , screen, silk, or letterpress, or a photoresist technique, and a step of curing with light or heat is performed sequentially to form a linear or mosaic shape. By repeating this process, you can install the next filter section without damaging the previous filter section with solvent or mechanical force. By repeating the steps for the type of filter you need, you can install the required filter section. Composite filter layers can be completed. It is generally preferable to form the filter layer to have a thickness of 1 to 10 μm from the viewpoint of transmittance characteristics.

The thickness of the thin film containing the composite filter layer obtained as described above is 5 to 100 μm, preferably 10 to 50 μm.

It is also preferable to further provide a transparent insulating protective layer made of resin or the like on the obtained composite filter layer. By doing so, the filter layer can be protected from wear and scratches during use, ozone generated during charging, image exposure, and the like. FIG. 3(A) is a cross-sectional view of the web consisting of the support l, the adhesive layer 2, and the thin film 3b after printing the composite filter layer, where 3a is the filter layer and R
lG and day indicate red, green, and blue filters, respectively. In FIG. 3 (Sunday), a protective layer 3c is further provided on the filter layer.

For the above reasons, it is preferable to use the photoreceptor having the structure (B).

The shape and arrangement of the color separation filters constituting the above-mentioned composite filter and the ratio of the number of individual microfilters constituting the composite filter are not particularly limited. If the body is drum-shaped, a wire whose lines are perpendicular to the direction of rotation or parallel to the direction of rotation can be used.

However, normally, a mosaic structure as shown in FIGS. 4(B) and 4(C) is used, and the size of each filter is 30 to 30 mm as the color repetition width (1112 in FIG. 4).
Preferably, the thickness is 500 μm.

If the size of the filter is too small, it will be susceptible to shadows from other adjacent color areas, and if the width of one of the filters is equal to or smaller than the particle size of the toner particles, it will be difficult to obtain high image density. It is also difficult to create. 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, FIGS. 3(A) to (B),
4(A) to 4(C) all show the case where so-called three-color separation filters of red, green, and blue are provided. In the figure, R indicates a red filter, G indicates a green filter, and day indicates a blue filter, but the coloring of the composite filter layer is not limited to these three colors, and a filter layer of any color can be formed as necessary. be able to.

The photoreceptor according to the present invention has a photoconductive layer provided on a conductive substrate, and the photosensitive layer is made of sulfur, selenium, amorphous silicon, or an alloy of these with tellurium, arsenic, antimony, etc. or inorganic photoconductors of oxides, iodides, sulfides, and selenides of metals such as zinc, aluminum, acetimone, bismuth, cadmium, and molybdenum, or in a binder resin. It is formed by dispersing and coating. Also, vinyl carbazole, anthracenephthalocyanine, trinitrofluorenone,
It is formed by similarly vapor depositing or dispersing an organic photoconductor such as polyvinylcarbazole, polyvinylanthracene, polyvinylpyrene, polycyclic quinone dye or pigment, disazo dye or pigment, and then coating. Such binder resins include polyethylene, polyester, polypropylene,
Examples include insulating and translucent resins such as polystyrene, polyvinyl chloride, polyvinyl acetate, polycarbonate, acrylic resin, silicone resin, fluororesin, and epoxy resin. Furthermore, a functionally separated photoconductor having a charge generation layer and a charge transfer layer is also used.

The conductive substrate includes metals such as aluminum, iron, nickel, copper, and stainless steel, alloys thereof, or thin layers of these metals provided on a polyester terephthalate film, etc. by laminating or vapor deposition. Various known substrates commonly used in electrophotographic photoreceptors can be used. The shape of the photoreceptor is not particularly limited, and any suitable shape or structure may be created as required, such as a drum shape, an endless belt shape, or a sheet shape.

After the step shown in FIG. 3, the thin film 3b having the filter layer 3a is peeled off from the support 1 and adhered to the surface of the photoreceptor, or
Alternatively, the thin film may be adhered to the surface of the photoreceptor and then peeled off, but the method for adhering the thin film may be to adhere the filter layer side to the surface of the photoreceptor, or to attach the back side of the thin film (i.e., the adhesive layer side before peeling) to the surface of the photoreceptor. It may also be glued. As for the method of adhesion,
If the adhesive layer remains on the support side when peeled off, apply the adhesive of the present invention described above to the photoreceptor surface or thin film side by a method such as coating or spraying to uniformly adhere it.
The desired surface of the thin film may be crimped. In addition, if the adhesive layer is attached to the thin film side and peeled off during peeling,
An adhesive layer may be formed in advance using the adhesive of the present invention as described above, and the adhesive layer surface of the peeled thin film may be directly attached to the surface of the photoreceptor. When adhering the thin film to the photoreceptor surface with the adhesive layer still attached, with the filter layer side facing outward, apply the adhesive to the photoreceptor surface or the filter layer side of the thin film, and attach the thin H filter layer side to the photoreceptor surface. Afterwards, the adhesive layer adhering to the surface may be removed using a solvent or the like.

As the adhesive for attaching the thin film to the photoreceptor, the same adhesive as used for the support and the adhesive layer provided on the thin film can be used. When attaching the thin film to the photoreceptor, the adhesion can be improved by applying heat or pressure.

FIG. 1 is a diagram schematically showing a cross section of a photoreceptor 40 produced as described above, in which a photosensitive layer 12 is provided on a conductive member 11, and the desired material produced by the method described above is provided on a conductive member 11. fine color separation filter (in the case of the figure, red (R), green (G)
), a blue (B) color separation filter) group, and a composite filter layer 3a consisting of a thin film 3b are bonded together using the adhesive 2 of the present invention described above. Reference numeral 13 denotes the above-mentioned eight adhesive layer of the present invention that adheres the thin film 3b having the filter layer 3a and the photoreceptor surface. FIG. 1(A) shows an example in which the thin film 3b side is adhered to the photoreceptor surface, and FIG. Figure (C) shows an example in which the filter layer side of the layer consisting of filter N3a and thin film 3b is adhered to the surface of the photoreceptor, as shown in Figure 1 (
D) is an example of a photoreceptor in which a protective layer 3c is previously provided on a filter layer 3a, and the protective layer 3C side is adhered to the photoreceptor surface.

The above conductive member 11 is made of aluminum, iron, nickel,
It may be made of metal such as copper, stainless steel, or an alloy thereof, and may have an appropriate shape and structure as necessary, such as a cylindrical shape or an endless belt shape.

In the above, the configuration in which the protective layer 3c or thin film 3b is present on the surface (FIGS. 1(B), (C), and (D)) is desirable in terms of durability and printing durability. The photoreceptor shown in FIG. 1C is relatively advantageous because the filter layer 3a is present on the photosensitive layer 12 side, so there is no image blurring due to light scattering.

Furthermore, the adhesive of the present invention can be adhered onto the photosensitive layer 12 with the adhesive applied to the thin film 3b or the filter layer 3a, but in this case, by reducing the heat capacity of the thin film 3b and the filter layer 3a, Even if the temperature of the adhesive of the present invention is high, the temperature of the photosensitive layer does not rise much during adhesion to the photosensitive layer. Therefore, it is possible to effectively prevent the photosensitive layer 12 from being adversely affected by the temperature at the time of melting (for example, crystallization in selenium).

The present invention can also be applied to photoreceptors in which a filter layer is provided below the photosensitive layer. The image forming method using this photoreceptor is described in Japanese Patent Application No. 59-199547, and uses a photoreceptor having an insulating layer, a photosensitive layer, and a transparent conductive member, and is charged with secondary and secondary charging. It is characterized in that image exposure and full-surface exposure with specific light are performed from the filter side on the back side. Figure 1 (E)
and (F) are examples of this type of photoreceptor, and in FIG. 1(E), the thin film side of a layer consisting of a thin film 3b and a filter layer 3a is adhered to the back surface of a transparent conductive member 11 using the adhesive 2 of the present invention. In FIG. 1(F), the filter layer side is adhered to the surface of the transparent conductive member 11 (15 is an insulating layer). in this case,
As the transparent conductive member 11, one in which a conductive film of tin oxide or the like is formed on a film by vapor deposition or sintering is preferably used.

FIG. 5 shows a thin film 3 with a filter layer 3a as described above.
An advantageous method is shown in which the adhesive 2 of the present invention is coated on the photosensitive layer 12 side when adhering the adhesive 2 on the photosensitive layer 12 (for example, when manufacturing the photoreceptor shown in FIG. 1(C)). has been done.

That is, as shown in FIG. 5(A), the photosensitive layer 12 is first formed on the conductive member 11, and then the adhesive layer 2 of the present invention is uniformly coated on the release film 16 using a roll coater. It is superimposed on the photosensitive layer 12 as shown by arrow 17. Then, as shown in FIG. 5(B), pressing is performed while the adhesive layer 2 is at a sufficient temperature to completely integrate them. Furthermore, as shown in FIG. 5(C), the release film 16 is peeled off and the adhesive layer 2 of the present invention is transferred onto the photosensitive layer 12. After that, the filter layer 3a is stacked as described above, and the photosensitive layer 1
Glue to 2.

In the method shown in FIG. 5, the adhesive 2 is directly applied to the photosensitive layer 12.
Rather than being applied onto the releasable substrate 16, it is first applied to the releasable substrate 16 and then transferred onto the photosensitive layer 12, so the application to the releasable substrate can be performed using a roll coater, an extrusion coater, etc. The adhesive can be applied easily and reproducibly (and uniformly).In this way, the adhesive is applied onto the releasable substrate, and while the temperature is sufficiently high and good adhesion is maintained, the photosensitive layer 12 is applied. A photoreceptor can be produced by stacking them on top of one another, pressing them, and punching them according to the shape.

At that time, better bonding strength can be obtained by heating the adhesive layer to some extent by irradiating the adhesive layer with a lamp or the like. Furthermore, this bonding method prevents the photosensitive layer from being damaged or causing poor conveyance. In addition, since the heat capacity of the adhesive and the releasable substrate can be made sufficiently small, the temperature of the adhesive is quite high (but the temperature of the photosensitive layer 12 during transfer does not rise much, and the next filter layer 3a is bonded as it is). Therefore, thermal damage to the photosensitive layer 12 is reduced.

FIG. 6 shows a composite filter having the structure shown in FIG. 1(C) which is laminated onto the photoreceptor surface of the photoreceptor coated with adhesive 2 while peeling off the thin film having the filter layer from the laminated web. A photoreceptor 1 having the following properties was obtained. In FIG. 6, 31 is an unwinding section for the laminated web, 32 is a winding section for winding up the support after the thin film has been peeled off, 33 is an unwinding section for the film photoreceptor, and 34 is a winding section for the completed photoreceptor. Department. 35 is a bat containing adhesive 2,
The adhesive 2 is applied to the surface of the photoreceptor as it is being unwound by an application roller 37. The amount of adhesive applied is Doctor 3
8. The filter layer surface of the laminated web is pressed onto the surface of the photoreceptor coated with an adhesive by a laminating roller 39, and the thin film having the filter layer is peeled off from the laminated web and adhered to the surface of the photoreceptor, resulting in a completed film-like photoreceptor. is wound up by the winding section 34.

The support with the adhesive layer from which the thin film has been peeled off is wound up by the winding section 32 .

In the apparatus shown in FIG. 7, the thin film having the filter layer is peeled off from the laminated web, cut into an appropriate size by a roller cutter 36, and then sent to a photoreceptor drum. The photosensitive drum 40 has the adhesive 2 attached thereto in advance by dipping, coating, or the like.

The thin film having the cut filter layer moves there and adheres to the photoreceptor drum.

The support with the adhesive layer from which the thin film has been peeled off is wound up into a support winding section.

The obtained photoreceptor 40 has the structure shown in FIG. 1(C).

In the above, whether a sheet-like photoreceptor with a color separation member attached is stretched on the drum or a color separation member is stretched on the photoreceptor drum, the sheet-like photoreceptor and the color separation member are stretched on the drum. By arranging the bonded parts of both the photoconductor and the photoreceptor at an angle to the direction of movement of the photoreceptor, the pressure against the cleaning blade is reduced, which improves the cleaning performance, and also improves the separation of the photoconductor from the bonding part and the color separation member. Peeling can also be prevented.

Next, a process for forming a multicolor image using the photoreceptor according to the present invention will be described. First, the entire surface is subjected to primary charging, secondary charging, and simultaneous image exposure to form a primary latent image corresponding to the color separation image density on the photosensitive layer below each filter. Next, by exposing the entire surface to specific light, only the photosensitive layer below the filter through which this specific light is transmitted forms a secondary latent image that has a surface potential strength or weakness corresponding to the intensity of the secondary latent image, that is, a potential pattern. form. This secondary latent image is developed with toner having a complementary color to that of the filter. From then on,
In order to prevent color mixing with the toner image on the photoreceptor, recharging smoothes the surface potential, full exposure to specific light forms a potential pattern in the next separation filter section, and a complementary color relationship with the filter. By repeating the toner development process, a multicolor image is formed on the photoreceptor. This multicolor image is superimposed and transferred onto the transfer material in only one transfer.

Next, the process of forming a multicolor image using the photoreceptor of the present invention will be explained using a specific example. Figures 8 [1] to [8] schematically show the image forming process in a portion of a photoreceptor using an n-type semiconductor such as cadmium sulfide as a photosensitive layer. 11 and 12 in the figure are a conductive member and a photosensitive layer, respectively, as in FIG.
3 is the high-resistance three-color (Sun, G, R) composite filter 3.
This layer includes a thin film 3b (and a protective layer in some cases), but to simplify the drawing, only the filter layer is shown and other layers are omitted. The adhesive layer 2 of the present invention is also not shown. In addition, the graphs at the bottom of each figure in Figure 8 are as follows:
It shows the potential on the surface of each part of the photoreceptor.

First, as shown in FIG. 8 [1], the photoreceptor 4 is charged by the charger 4.
Give a positive corona discharge to the surface of 0. As a result, a positive charge is generated on the surface of the layer 3 containing the composite FIG, and a corresponding negative charge is induced on the interface between the photosensitive layer 12 and the layer 3 containing the filter, resulting in the state shown in FIG. 8 [1]. becomes.

Next, as shown in FIG. 8 [2], alternating current or negative discharge is applied by the charger 5 equipped with an exposure slit to erase the charge on the surface of the composite filter 3, while exposing the image from the multicolor original. administer. In this example, image formation is performed by performing multicolor image exposure of red, green, and blue; however, for ease of understanding, the image formation process will be described using an original having only a red image as an example.

FIG. 8 [2] shows the state of the image exposure (arrow Li) from the red image. Red light.

passes through the N3 red color separation filter section 3R and makes the photosensitive layer 12 below it conductive, so that most of the positive charges on the layer 3 are erased and the above induced in the photosensitive layer 12 is Negative charges are also erased, and the surface potential becomes close to zero potential.

On the other hand, since the green and blue separation filter sections 3G and 3B do not transmit the red light, some of the positive charges on the layer 3 are erased, but the negative charges in the photosensitive layer 12 remain as they are. , and a charge corresponding to the partially erased positive λ charge is induced in the conductive member I+. In such a charge arrangement, the surface potentials on the green and blue separation filter sections 3G and 3B are close to zero potential. However, as the scorotron charger of the charger 5, the polarity may be reversed by controlling the grid voltage to provide a uniform surface potential of, for example, -200V. Therefore, although the composite filter contains a charge pattern as a primary latent image, a toner image cannot be formed because no surface potential difference occurs.

Next, as shown in FIG. 8 [3], the entire surface is exposed to specific light that generates a potential pattern in only one type of decomposition filter of the composite filter 3, for example, blue light L8 obtained by the light source 6 and the blue filter FII.

In this case, a part of the negative charges on the photosensitive layer 12 at the bottom of the decomposition filter 3B that transmits blue light and the positive charges on the conductive member I are neutralized, as shown in FIG. 8(3). A negative charge remains between the layer 3 and the photosensitive layer 12 corresponding to the portion of the resolving filter 3B, giving a positive surface potential on the composite filter.

As shown in FIG. 8 [4], by developing this with the developing device 7 carrying negative yellow toner T7, a partial yellow toner image of the separation filter 3B is formed. Separation filter 3 on which this yellow toner image is formed
In area B, the surface potential has not yet been saturated by the toner, so as shown in the lower graph, a relatively high surface potential remains, and another toner is absorbed by the next development process. There is still room for attachment.

Therefore, as shown in FIG. 8 [5], the surface of the layer 3 is recharged with alternating current or negative direct current, preferably negative corona discharge by a scorotron charger 8, and the graph shown in the lower part of FIG. 8 [5] is applied. The surface potential is returned to a flat state as shown in
It is preferable to make the surface potential equal to the surface potential in FIG. 8 [2].

Next, as shown in FIG. 8 [6], by exposing the entire surface to green light (arrowed) obtained by the light source S and the green filter FG, the negative charges in the photosensitive layer 12 are removed from the conductive member. 11 are neutralized, and a high surface potential shown in the lower graph is obtained in the 3G region of layer 3.

By developing this with a developing device S carrying magenta toner rays as shown in FIG. 8 [7], a magenta toner image is obtained in the 3G region.

Next, after recharging (Fig. 8 (8)), the red filter FR
Although the entire surface is exposed to the red light obtained by the process, no potential pattern is generated at this time, and development with cyan toner TC is not performed. Thus, when the yellow toner image and the magenta toner image are transferred and fixed onto the transfer material, a red image in which yellow and magenta are superimposed is visually observed on the transfer material.

The above explanation is based on the case where the original is a red image, but the three-color separation method and the subtractive color mixture method can also be used when the original is a white, green, blue, yellow, magenta, cyan, or black image. Color reproduction is performed by combining primary color toners. FIG. 9 is a diagram illustrating the process of color reproduction when such originals of each color are used. In FIG. 9, the horizontal axis represents the color tone of the original, and the vertical axis represents the process at each stage leading to toner image formation when each color original is used.

The symbol r(''')J represents the formation of a primary latent image, the symbol "○" represents the formation of a secondary latent image, and the symbol "0" represents the process at each stage of toner image formation. Further, the symbol "↓" represents that the state of the upper shelf is maintained as it is, and the blank space represents a portion where no latent image formation is performed.

FIG. 10 is a sectional view of essential parts of a multicolor image forming apparatus for copying multicolor images using the photoreceptor 40 described above. 4
0, the film-like photoreceptor 12 is placed on a metal drum 11.
4 is a positive direct current primary charger, 5 is a negative direct current corona discharge scorotron charger having a slit for image exposure, and 6 is a blue filter F.
A light source has I+ and emits blue light L8, and 7 is a developing device containing yellow toner. 8 is a scorotron charger for negative direct current corona discharge; 9 is a light source having a green filter FG and emits green light; 10 is a developing device containing magenta toner; 14 is a scorotron charger for negative direct current corona discharge , 1st has a red filter F, and is a light source that irradiates red light, and 1st is a developing device containing cyan toner. P is a transfer material, 51 is a transfer electrode, 52 is a separation electrode, 53 is a static eliminator for removing residual charges that removes static electricity while exposing the back side of the electrode to white light, and 54 is a cleaning blade for removing residual toner.

The photoreceptor 40 having the above configuration is first uniformly positively charged by the charger 4, and then negatively charged or AC charged by the charger 5, and at the same time, an image is exposed from the original of the three primary colors of blue, green, and red. Scan and expose the area. On the photoreceptor 40, a color-separated primary latent image corresponding to the intensity of image exposure from the original is formed for each color separation filter of the composite filter. Then a white or blue light J! with a blue filter FIl! i, 6 to form an electrostatic charge image corresponding to the above-mentioned second-order latent image in the area of the blue separation filter, which is then developed in yellow by a yellow developer 7 t4°.Next, it is negatively charged with a scorotron. After erasing the electrostatic charge image remaining in the region of the blue separation filter using a device 8, the entire surface is exposed to white or green light a9 equipped with a green filter FG, and magenta is developed with a magenta development layer 10.

Next, after erasing the remaining electrostatic image using the negative scorotron charger 14, the entire surface is exposed to light using a white or red light source equipped with a red filter FR for one day, and then the cyan developer I
Develop cyan with S.

In this way, a multicolor toner image corresponding to the original is formed on the photoreceptor, and is transferred to the transfer material P fed at the same timing by the action of the transfer electrode 51 and separated by the action of the separation electrode 52. After that, the image is fixed by a fixing device (not shown).

On the other hand, after the photoreceptor 40 has been transferred, the static electricity is removed by a static eliminator 53, and then residual toner is cleaned by a cleaning blade 54, and the photoreceptor 40 is prepared for the next image formation.

In the above description, an n-type semiconductor is used as the photoreceptor, but a photoreceptor using a p-type semiconductor such as selenium may also be used. In this case, the sign of the charge is simply reversed. Basically there is no difference.

Of course, either of the p-type and p-type photoreceptors may be used.

As is clear from the above description, the photoreceptor according to the present invention is a photoreceptor in which an insulating composite filter is provided on the photoreceptor layer, and as a method for forming an image using the photoreceptor, only one step is required. q/, After forming a primary latent image by exposure, three colors) ha\
By repeating the process of exposing the entire surface to light according to the method, forming a secondary latent image for each color of the color separation filter that makes up the composite filter, developing it with toner of the corresponding color, and recharging. It is designed to obtain a multicolor image.

As mentioned above, a known method that utilizes charges induced in the photosensitive layer is used, but when forming a secondary latent image by second and subsequent full-surface exposures, the problem caused by the residual latent image of the first song is eliminated. Therefore, recharging is required. This recharging is carried out by alternating current or direct current discharge of opposite polarity to the remaining electrostatic image, preferably by direct current corona discharge of opposite polarity to the remaining electrostatic image by a scorotron charger. Note that "charging" as used in the above method includes cases where the surface potential obtained when charging becomes 0 or the surface charge disappears.

In addition, according to the present invention 1, -order charging, secondary charging with substantially opposite polarity to -order charging, recharging for smoothing the potential pattern after image exposure, whole surface exposure with specific light, and specific color. It can also be applied to an image forming method in which development with toner is repeated.

The above development is preferably carried out by a magnetic brush method, and the developer used is either a so-called l-component developer using non-magnetic toner or magnetic toner, or a so-called two-component developer containing a mixture of toner and a magnetic carrier such as iron powder. can do. For development, a method of 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 is recommended. A developing method in which the gap between the developing sleeve and the photoreceptor is set larger than the thickness of the developer layer on the sleeve (provided there is no potential difference between the two),
For example, U.S. Patent No. 3,893,418, JP-A-5
Publication No. 5-18656, Japanese Patent Application No. 58-57446, Japanese Patent Application No. 58-238295, Japanese Patent Application No. 58-238
It is particularly preferred to use a method such as that described in each specification of No. 296. In this method, a one-component developer consisting only of non-magnetic toner and a two-component developer containing non-magnetic toner are used, and an alternating electric field is formed in the developing area, and the electrostatic image support is It is preferable that the developer layer be brought into contact with the developer layer and that development is carried out without overlapping the toner.However, a developer using ζJ toner may also be used.

The color toner used for development is usually prepared using known binders (such as various chromatic colors such as 41 fats, organic and inorganic pigments, and dyes, and various additives such as charge control agents, etc., and known techniques such as IFF) used in toners. A toner for developing electrostatic images made by the above can be used.As the carrier, iron powder or ferrite, which is usually used for electrostatic images, or more preferably iron powder or ferrite coated with a resin can be used. Alternatively, various known carriers can be used, such as a high resistance magnetic carrier such as a carrier in which a magnetic material is dispersed in a resin.

In addition, the applicant previously filed the patent application No. 58-2496.
69 and 5B-240066 may be used.

The above description describes an example of a color copying machine using so-called three-color separation filters and three primary color toners, but the embodiments of the present invention are not limited to this, and various types of It can be widely used in multicolor image recording devices, color photo printers, etc.

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.

When a multicolor original is copied using this apparatus, a beautiful copy without image shift or color blurring can be obtained.

Furthermore, in the above explanation, the spectral characteristics of light for full-surface exposure can be obtained using blue (B), green (G), and red (R) filters, but they can also be obtained by means other than filters. Moreover, its spectral characteristics are not limited to day, Q, and R. In short, any spectral characteristic is sufficient as long as it forms a potential pattern only in a specific filter section corresponding to the specific light on the photoconductor by exposing the entire surface to the specific light. Therefore, the above-mentioned "multiple types of filters" include the car model's color separation filter (a filter that transmits light only in a specific wavelength range) and the part without a filter (which may be transparent resin or the atmosphere). A photoreceptor having layers may also be used. The portion without this filter is regarded as a transparent filter, and is included in the above-mentioned "multiple types of filters".

EXAMPLES Hereinafter, the present invention will be specifically explained using Examples, but the embodiments of the present invention are not limited thereby.

Example 1 Ketjen black (conductive carbon) and petrified vinyl
A 2.3 μm thick conductive layer made of a maleic acid copolymer, a 21.5 μm thick charge transport layer (CTL) made of the following compound 1, and a 1 μm thick charge generation layer made of the following compound 2. (CGL) and a photoreceptor having the structure shown in FIG. 1 (C) and FIG. 4 (B) using the apparatus shown in FIG. An image carrier was prepared by bonding a 2 μm color separation filter on a 15 μm thick polyester film.

2H5 In this example, an epoxy resin adhesive, Arteco epoxy = Arteco F-05 (manufactured by Alpha Giken Co., Ltd.), was used for bonding (adhesion) between the thin film having the filter layer and the photoreceptor. In the photoconductor in the photoconductor winding section,
The adhesive was cured by standing in the dark at room temperature for about 4 minutes.

Next, the above-described image carrier was incorporated into an image forming apparatus shown in FIG. 12, and an image was formed. In FIG. 12, the image carrier 40 was charged with a direct current scorotron corona discharger 4 so that the surface potential of the image carrier 40 was 12,500 square meters while uniformly exposing the image carrier 40 with the lamp of the primary charger 4.

In this case, the peripheral speed of the image carrier was 80 mm/sec.

Next, while image exposure is being performed, the image carrier 40 is
was charged so that its surface potential was +50V. During image exposure, infrared and ultraviolet light was previously canted with a filter.

Next, by performing uniform exposure through a blue filter, the white background part of the original paper is +50V and the black background part of the original paper is -280V.
An electrostatic image with a contrast of about 330 cm of V was formed.

This potential contrast was about 1/3 of that when a transparent insulating layer was used. This electrostatic image was developed using a developing device 7.

In the developing device 7, 70 wt% of magnetite was dispersed in the resin, the average particle size was 25 μm, and the magnetization was 30 emu/
A carrier with a g resistivity of 1014 Ω-■ or more; a styrene-acrylic resin containing 10 parts by weight of a benzidine derivative as a yellow pigment and other charge control agents and an average particle size of 1
A developer consisting of a positive charging non-magnetic toner T of 0 μm,
was used under conditions such that the ratio of toner to developer was 20 wt%. In addition, the developing device 7 clearly shown in FIG.
The outer diameter of the developing sleeve 47 is 30 mm, the rotation speed in the direction of arrow B is 1100 rp, the magnetic flux density of the N and S magnetic poles of the magnet body 43 rotating in the direction of arrow A is 900 Gauss, the rotation speed is 11000 rp, in the developing area. The thickness of the developer layer is 0.3
Open, gap between developing sleeve 47 and image carrier 40 0, 5
mm, and the developing sleeve 47 has a superimposed voltage of -100V DC voltage and 2.0kHz, 1000V AC voltage (
The amplitude of the construction wave is ffxtoo.

(2)) was applied under non-contact development conditions.

Incidentally, while the electrostatic image was being developed by the developing device 7, the other similarly configured developing devices 10 and IS shown in FIG. 12 were kept in a state in which no development was performed. It is possible to electrolyze the developing sleeve.
, 46 to be in a floating state, or grounded, or by actively applying a DC bias voltage of the same polarity as the electrostatic image (that is, the opposite polarity to the toner charging) to the developing sleeve. Among these, it is preferable to apply a DC bias voltage. Further, the driving of the developing device was stopped during non-developing time. developer 1o,
Since the IS is also assumed to perform development under the same non-contact development conditions as the developing device 7, the developer layer on the developing sleeve does not need to be removed. This developing device 10 uses a developer having a composition in which the toner in the developing device 7 is changed to a toner containing polytungstophosphoric acid as a magenta pigment instead of a yellow pigment, and the developing device IS also uses A developer was used in which the toner was changed to a toner containing a copper phthalocyanine derivative as a cyan pigment. Of course, color toners based on other pigments or dyes can be used, and the order of developing colors can be appropriately determined so as to obtain clear color images. In particular, the order of development needs to be carefully determined because it may be related to the sharpness of the color image and the potential contrast obtained.

The surface of the image carrier 40 developed by the developer 7 was recharged to a surface potential of +110 V by a scorotron corona charger, and then uniformly exposed to light through a green filter.

The potential of the electrostatic image obtained by this is +80V for the white background.
In contrast, the black background part had a voltage of -230V. This electrostatic image
DC component + IOV, AC component 2.0kF in the developing sleeve
Developing was carried out in the developing unit 10 under the same conditions as in the developing unit 7 except that a voltage of 1000 V was applied.

Similarly, the scorotron charger increases the surface potential to +130
After being recharged to V, uniform exposure was performed through a red filter. As a result, an electrostatic image of -180 V on the black background part is formed with respect to a white background part of +120 cm, and this electrostatic image is applied to the developing sleeve with a DC component of +50 V, an AC component of 2.0 kHz,
Developing was carried out in the developing device 19 under the same conditions as in the developing device 7 except that a voltage of 100 OV was applied.

When this third development is performed and a three-color image is formed on the image carrier 40, the corona discharger 20 and the pre-transfer lamp are activated, thereby transferring the color image. The image was easily transferred onto copy paper P using a transfer device 51, separated using a separator 52, and fixed using a heat roller fixer 21.

The image carrier 40 to which the color image has been transferred is charged with a static eliminator while being irradiated with white light, residual toner is removed from the surface by the cleaning blade 54 of the cleaning device 22, and the surface on which the color image has been formed is removed by the cleaning device. 22, the complete cycle of color image recording was completed.

The image forming conditions in Example 1 are summarized in Table 1 below.

The image bearing member 40 is a 60 μm thick 5-To optical layer having spectral characteristics as shown in FIG.
A 2 μm thick color separation filter having the structure shown in the figure (Japanese) and the spectral characteristics shown in FIG.
A material obtained by bonding the material provided on the polyester film No. m was used. The adhesive used was the same as in Example 1. Image formation similar to Example 1 was performed under the conditions shown in Table 2 below.

The drum diameter of the photoreceptor used was 200 mm, and the circumferential speed of the photoreceptor drum was 200 mm/sec.

Example 1.2 below is an example in which a 7R film having a filter layer is attached to a sheet-like photoreceptor, but in this Example 3,
A composite filter layer is printed in the same manner as above on a web that has been subjected to a release treatment on the thin film side and the release treatment on the support side is stopped so that the adhesive remains on the support side when peeled off, to form a laminated web. Created.

Using the apparatus shown in FIG. 7, the thin film having the filter layer was peeled from the laminated web, cut into a suitable size, and then sent to a photoreceptor drum. An adhesive was applied to the photoreceptor drum in advance by dipping. In this example, the photosensitive drum with the obtained thin film was left at room temperature for about 4 minutes, so that the adhesive was cured. The storage location was a dark place.

The obtained photoreceptor has the structure shown in FIG. 1(C). There is an adhesion method in which a filter layer is installed on the side of the photoreceptor as shown in Figure 1 (C), and a thin film with a filter layer is installed in Figure 1 (C).
) (Fig. 1 (A): separating the photoreceptor surface and the filter layer). However, it is preferable to bond as shown in FIG. 1(C). The reason for this is that it is resistant to wear and scratches during use, and
It has the advantage that the filter layer is not exposed to ozone. If there is a risk of contamination of the photoreceptor due to the influence of the adhesive,
The configuration shown in Figure 1 (Japanese) is desirable.

Although the adhesive used in Examples 1 to 3 is water-insoluble, in this comparative example, a water-soluble adhesive (e.g., casein) was used to adhere the filter, and the filter was similarly subjected to image formation. did.

As a result, the images produced by the photoreceptor produced using the adhesive according to the example were good, whereas when produced using a water-soluble adhesive, image fading occurred depending on the type of adhesive. There were a variety of cases, including some with no image contrast, and some with no toner adhesion and no image formation. None of the photoreceptors in which an adhesive layer of a water-soluble type adhesive was interposed could produce images superior to those obtained by the photoreceptor using the adhesive according to the example.

With water-soluble adhesives, since the adhesive itself has low resistance, the charges may not be retained in the formed primary latent image and may flow to another filter section, or may be injected from the substrate during primary charging. It is thought that the above phenomenon occurs because charges of opposite polarity to the primary charges are not trapped.

Therefore, it is necessary to use a high resistance adhesive of the type according to the invention to bond the photosensitive layer and the filter layer.

[Brief explanation of drawings]

The drawings illustrate and explain the present invention.
Figures (A), (B), (C), (D), (E) and (F)
2 is a partial sectional view of various photoreceptors, FIG. 2 is a partial sectional view of a thin film provided on a support, and FIGS. 3(A) and (B) are sectional views of a laminate having a composite filter. Figures 4 (A), (Japanese) and (C) are partial plan views showing various patterns of filters, Figures 5 (A), (B) and (C) are main stages showing other bonding methods. A partial cross-sectional view, FIGS. 6 and 7 are schematic diagrams showing the process of adhering the filter layer to the photosensitive member, and FIGS. 8 [1], [2], [3], [4], [5], 6
], [7] and [8] are diagrams explaining the image formation process from a red original, Figure 9 is a diagram explaining the image formation process from various colored originals, and Figures 10 and 12 are multicolor images. 11 is a spectral diagram showing the spectral characteristics of the filter, FIG. 13 is a sectional view of the developing device, and FIG. 14 is a graph showing the photosensitivity of the photosensitive layer. In addition, in the reference numerals shown in the drawings, 1-.
−−−−−−−−・−Filter layer 3 b−−−−−−
-------・Thin film 3 c-1---------・-・Protective layer 11-・---------・-・Conductive member 12-・～・・−----1 Photosensitive It is a layer. Agent Patent Attorney Hiroshi Aisaka Figure 2 Figure 3 Figure 1 Figure 4 Figure 5 Figure 6 Figure 7 Figure 11 Figure 12 [11 [4] Figure [21 ■ [3] [5] [8] ] Figure 8 [6] RO - Kuan Senkou Hat Button Procedural Amendment Form October 14, 1985 1. Indication of the case 1988 Patent Application No. 110312 2. Name of the invention Photoreceptor 3. Person making the amendment Relationship to the incident Patent applicant address 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name
(127) Roku Konishi Photo Industry Co., Ltd. 4, Agent Address: 2-4-11 Shibasaki-cho, Tachikawa-shi, Tokyo FINE Building Equipment 0425-24 5411fN5 6. Will the number of inventions increase due to the amendment? ,? ili Positive Object''・, -0L (1) Correct "acetimone" to "antimony" on page 14, line 8 of the specification. (2), rseTeJ on page 44, line 3 of [5eT
I will correct it as eJ. One or more -

Claims (1)

[Claims] 1. A photoreceptor in which a layer having a color separation function is adhered to the upper side and/or the lower side of the photosensitive layer via an epoxy resin adhesive.