JPS635349A - Photosensitive body - Google Patents

Abstract

PURPOSE:To obtain the titled body capable of giving a good adhesion which satisfies performances such as uniformity of an adhering layer by adhering a color separation layer to an upper side or/and a lower side of the photosensitive layers with a solvent type sticking agent. CONSTITUTION:The layer having the color separation function (the color separation layer or the color separation member such as a mosaic filter, etc.) is adhered to the upper side or/and the lower side of the photosensitive layers 12 with the solvent type sticking agent. The specific sticking agent, namely the solvent type sticking agent is used for adhering the color separation layer (especially, color separation member such as a mosaic filter) to the photosensitive layer. Said sticking agent may be formed to a sticking tape by dissolving the sticking agent to a solvent, subsequently coating an obtd. solvent solution on a substrate, followed by completely vaporizing the solvent from a coating layer. In case of contaminating a filter layer 3a and the photosensitive body with the solvent, a transparent protective layer 3a having an insulating property is preferably mounted on the surfaces of the filter layer 3a and the photosensitive body, respectively. Said sticking agent displays the sticking force, without heating it, and the adhering layer is uniform and stable, and has the good transparency and insulating property, etc.

Description

[Detailed description of the invention] a. INDUSTRIAL APPLICATION FIELD The present invention relates to photoreceptors, particularly electrophotographic photoreceptors.

mouth. 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, since transfer is repeated multiple times, there is a problem in that it is difficult to align the images during transfer.

As an improvement on these shortcomings, Japanese Patent Application No. 1987-1
No. 85440, No. 59-187044, No. 59
- No. 199547, No. 60-229524, etc., a composite filter layer in which multiple types of microfilters of different colors are arranged in a mosaic pattern is placed above the photosensitive layer (the side to which toner adheres during development) or below the photosensitive layer. side(
An image forming method using a photoreceptor on the side to which toner is not attached during development has been proposed. According to this method, after image exposure is applied through a composite filter bonded to a photoreceptor, the entire surface is exposed to specific R, G, and B lights, and the portions of the composite filter corresponding to the specific filters are exposed. A multicolor image is formed on a photoreceptor by forming an electrostatic image corresponding to the light transmitted through the filter, developing it using a specific color toner, and smoothing it by recharging, repeated for each type of filter. Since the image forming method is fixed, it has the advantage that only one image exposure is required and there is no need for alignment, and it is possible to easily obtain a high-quality multicolor image.

C. 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 prepared by mixing PS-623 and a hardening agent KN-40 at a ratio of 5:1 and further diluting the mixture to 2 times with methyl ethyl ketone is used (Japanese Patent Application Laid-open No. 16645/1983).

One idea is to use such an adhesive to adhere the above-mentioned mosaic filter, which is a color separation filter, onto the spectroscopic layer, but the results are unsatisfactory.

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 between the photoreceptor and the color separation member (mosaic filter) must be uniform.

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

(3). Use an adhesive that does not release water 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 is an adhesive (including a curing agent) that dissolves or contaminates the photoreceptor and color separation member, it is preferable to avoid this.

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

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

(7). A highly insulating material is best (if it is conductive, charge will flow and the image will look blurred).

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

Ho. The structure of the invention and its effects, that is, the present invention provides a layer having a color separation function (hereinafter referred to as a color separation layer or a color separation member) on the upper side and/or the lower side of the photosensitive layer, which is a solvent-based adhesive. This is related to the angry light body attached by.

According to the present invention, a specific adhesive, that is, a solvent-based adhesive is used to attach the color separation layer (in particular, the color separation member such as the mosaic filter mentioned above). It is possible to create an adhesive tape by dissolving the agent in a solvent and applying it, allowing the solvent to completely evaporate.

If the filter layer and photoreceptor are contaminated by the solvent, an insulating transparent protective layer may be applied to the filter layer and photoreceptor surfaces, respectively.

This adhesive can exhibit sufficient adhesion without requiring heating, has a uniform and stable adhesion layer, and has good transparency and insulation properties. Therefore, it is very advantageous to realize the object of the present invention.

Examples of the components of the solvent-based adhesive that can be used are as follows.

Silicone 3 parts by weight High molecular weight polyester 2 parts by weight Phenol resin
4 Mica powder
8 Antioxidant
3 Alkylphenol disulfide 2 // Methylene bis-4-phenol isocyanate 0.25
〃 In this way, by providing the color separation layer on the phosphor using an adhesive, it is possible to adhere the phosphor layer and the filter layer relatively easily, and since the polymer is used, the insulation is You can choose one that has high properties and does not contaminate the photoreceptor or filter layer. Similarly, one can be selected that has high transmittance for the emission spectrum of imagewise exposure (principal wavelengths of 450 nm, 550 nm, 650 nm, etc.). When a water-insoluble adhesive is used, the amount of charge trapped at the interface between the photosensitive layer and the adhesive layer is considered to be higher than when the adhesive layer is not used. In addition to serving to bond the photosensitive layer and filter layer, it also protects the photosensitive layer.

The thickness of the adhesive of the present invention is preferably about 1 micron when attaching the angry light 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 peeling off the thin film from the support, and removing the thin film having the filter layer from the photosensitive layer. This method includes the step of attaching the above-mentioned solvent-based adhesive to the upper or lower side.

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 triacetate, are preferably used. The thickness of these supports varies depending on the properties of the material, but is preferably about 100 μm.

An adhesive layer is provided between the support and the thin film for forming the filter layer to temporarily adhere the two, but there is no particular adhesive layer, and various known adhesives can be used. Adhesives and adhesives can be used.

The thin film may be constructed using the same plastics as the support, and its thickness is not particularly limited, but it must be strong enough to be handled as an independent film when peeled from the support. It is desirable that the thickness be as thin as possible, and in practice it is preferably 5 to 100 μm thick. Moreover, when the thin film is provided on the photosensitive layer, 1
Although it is preferable to have a resistance value of 0'3 Ω-cm or more, no particular limitation is required when it is provided below the light-transmitting 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 adhesiveness between the thin film and the adhesive layer is higher than the adhesiveness 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 between the adhesive strengths 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 above-mentioned solvent-based adhesive.

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 the desired color and a transparent resin (preferably a hardening resin that hardens with heat or light), or by printing directly on the thin film. Although a method of forming a filter layer with a desired pattern using a resist technique is preferred, various other methods can be used, such as a method of thermally transferring a colorant.

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. It is preferably insoluble in solvents, and is formed by containing 70% by weight or more of a resin and less than 30% by weight, preferably 2% by weight or more of an organic dye or pigment soluble in an organic solvent as a coloring agent. It is preferable to do so. As such a coloring agent, for example, organic dyes or pigments such as copper cap cyanine, methylene blue, cyanine blue, and Victoria blue are used for blue filters. For green filters, organic dyes or pigments such as brilliant green, maraca green, and naphthol green are used; for red filters, organic dyes or pigments such as fuchsin, phenosafranin, and rhodamine B1 naphthol resin are used. used.

In addition, plasticizers, etc. to improve the processability of the filter layer,
In order to prevent the colorant from fading due to ultraviolet rays, an ultraviolet absorber such as Tinuvin (trade name, manufactured by Ciba Corporation) 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, Hensen, ethyl acetate, methyl ethyl ketone, acetone, etc. is used to form a filter layer on the thin film. 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 solvents or mechanical force, and by repeating the operation for the type of filter you need, you can create the required complex The filter layer 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 preferable to further provide an insulating protective layer made of resin or the like and transparent to white light or infrared light on the obtained composite filter layer. By doing so, the filter layer can be protected from abrasion, scratches, dirt, ozone generated during charging, image exposure light, etc. during use. Figure 3 (A
) is the support 1 after printing the composite filter layer,
It is a sectional view of a web 7 consisting of an adhesive layer 2 and a thin film 3b, where 3a is a filter layer, and R and GSE3 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. When the photoreceptor is drum-shaped, it is possible to use one in which the lines are perpendicular to the rotational direction or parallel to the rotation direction.

However, normally, a mosaic structure as shown in Fig. 4 (B) and (C) is used, and the size of each filter is determined by the color repetition width (f, Il2 in Fig. 4). 3
It is preferable to set it as 0-500 micrometers.

If the size of the filter is too small, it will be easily affected by other adjacent color parts, and if the width of one of the filters is equal to or smaller than the particle size of the toner particles, it may 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, Figures 3 (A) to (Japanese),
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 formed on a conductive substrate, and the photoreceptor layer includes sulfur, selenium, amorphous silicon, or combinations of these with tellurium, arsenic, antimony, etc. Photoconductors consisting of alloys or inorganic photoconductors of oxides, iodides, sulfides, and selenides of metals such as zinc, aluminum, acetimone, bismuth, cadmium, and molybdenum are deposited or in a binder resin. It is formed by dispersing and coating. In addition, organic photoconductors such as vinylcarbazole, anthracenephthacyanine, trinitrofluorenone, polyvinyl ruhazole, polyvinylanthracene, polyvinylpyrene, polycyclic quinone dyes or pigments, disazo dyes or pigments can be applied thinly or dispersed in a resin. , is formed by coating. Such binder resins include polyethylene, polyester, polypropylene, polystyrene, polyvinyl chloride, polyvinyl acetate, polycarbonate, acrylic resin, silicone resin, fluororesin,
Examples include insulating and translucent resins such as epoxy resins. 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.

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 the thin film 3b is peeled off after adhering to the surface of the photoreceptor. It may be adhered to the body surface, or the back side of the thin film (ie, the adhesive layer side before peeling) may be adhered to the photoreceptor surface.

As for the adhesion method, if the adhesive layer remains on the support side when it is peeled off, apply or spray the above-mentioned solvent-based adhesive on the photoreceptor surface or the thin film side to uniformly adhere it to the thin film side. All you have to do is press the desired surface.

In addition, if the adhesive layer adheres to the thin film side and peels off during peeling, the adhesive layer can be formed in advance with the above-mentioned solvent-based adhesive, and the adhesive layer side of the peeled thin film can be directly attached to the photoreceptor surface. May be pasted directly. When attaching the thin film to the photoreceptor surface with the adhesive layer still attached, with the filter layer side facing outward, apply adhesive to the photoreceptor surface or the filter layer side of the thin film, and affix the filter layer side of the thin film 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 adhesives as those 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 prepared as described above, in which a light-absorbing layer 12 is provided on a conductive member 11, and a photoreceptor layer 12 is provided thereon. The required fine color separation filters (in the case of the figure, red (R), green (G)
), blue (B) color separation filter), and a layer 3 consisting of a thin film 3b are bonded together with the above-mentioned solvent-based adhesive 2. 13 is the above-mentioned solvent-based adhesive layer 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. 1(B) shows an example in which an insulating protective layer 3c is previously provided on the filter layer but the thin film 3b side is adhered to the photoreceptor surface. FIG. 1(C) shows an example in which the filter layer side of a layer consisting of a filter layer 3a and a thin film 3b is adhered to the photoreceptor surface.
) is an example of a photoreceptor in which a protective layer 3C is previously provided on the 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 retaining layer 3c or the thin film 3b is present on the surface {FIGS. 1(B), (C), and (D)) is desirable in terms of durability and rigidity. The photoreceptor shown in FIG. 1C is relatively advantageous because the filter layer 3a is present on the light scattering side [2], so there is no image blurring due to light scattering.

Further, the adhesive of the present invention can be attached to the photosensitive layer 12 while being provided on the thin film 3b or filter layer 3a side.
At this time, by reducing the heat capacity of the thin film 3b and the filter layer 3a, the temperature of the light absorbing layer does not rise much when it is attached to the light absorbing layer even if the temperature of the solvent-based adhesive is quite high.

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 primary and secondary charging is It is characterized in that it is performed from the insulating layer side, and the image exposure and the entire 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 FIG. 1(E) shows one in which the thin film side of a layer consisting of a thin film 3b and a filter layer 3a is attached to the back surface of a transparent conductive member 11 with a solvent-based adhesive 2. , 1st
In Figure (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 such as tin oxide is formed on a film by rattan coating or sputtering is preferably used.

FIG. 5 shows a thin film 3 with a filter layer 3a as described above.
When adhering b onto the photosensitive layer 12 (for example, when manufacturing the photoreceptor shown in FIG. 1(C)), a solvent-based adhesive 2 is applied to the photosensitive layer 12 side.
An advantageous method is shown for applying the .

That is, as shown in FIG. 5(A), a photosensitive layer 12 is first formed on a conductive member 11, and then a solvent-based adhesive layer 2 is uniformly coated on a release film 16 using a roll coater. It is superimposed on the photosensitive layer 12 as shown by arrow l7. Then, as shown in FIG. 5(B), the adhesive layer 2 is pressed at a sufficient temperature to be completely integrated. Furthermore, as shown in FIG. 5(C), the release film 16 is peeled off and the adhesive N2 is transferred onto the photosensitive layer 12. Thereafter, the filter layer 3a is layered and adhered to the photosensitive layer 12 as described above.

In the method shown in FIG. 5, the adhesive 2 is directly applied to the angry light 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. Can be applied easily and uniformly with good reproducibility. In this way, the adhesive is applied onto the releasable substrate, and while the temperature is sufficiently high and the adhesive has good adhesive strength, it is stacked on the photosensitive layer 12 and pressed, and then punched out according to its shape. A photoreceptor can be manufactured by

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 light-transmitting layer from being scratched or causing transport defects. In addition, since the heat capacity of the adhesive and the releasable substrate can be made sufficiently small, the temperature of the photosensitive layer 12 during transfer does not rise much even if the temperature of the adhesive is quite high, and the next filter layer 3a can be adhered as it is. Therefore, thermal damage to the photosensitive layer 12 is reduced.

FIG. 6 shows a composite film having the structure shown in FIG. 11(C) which is laminated onto the phosphor surface of the phosphor coated with adhesive 2 while peeling off the thin film having the filter layer from the laminated film. A photoreceptor 1 having a filter was obtained. In FIG. 6, numeral 31 is an unwinding part of the laminated wenob, 32 is a winding part for winding up the support after separation of the thin film I1, 33 is an unwinding part of the film-like photoreceptor, and 34 is the unwinding part of the completed photoreceptor. This is the winding section. Reference numeral 35 denotes a vat containing the adhesive 2, and the adhesive 2 is applied to the surface of the photoreceptor as it is being unwound by the application roller 37. The amount of adhesive applied is regulated by a doctor 38. 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 filter-like web. The light body 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 in the winding section 32.

In the apparatus shown in FIG. 7, a thin film having a filter layer is peeled off from the laminated webbing, cut to an appropriate size by a roller cassotater 36, and then sent to a photoreflector drum. The photosensitive drum 40 has the adhesive 2 adhered to it in advance by denobbing, coating, or the like.

It is heated by an external heating device to melt the adhesive and give it adhesive properties. The laminated webbing may be heated by an external heating device, or both the photoreceptor drum and the laminated webbing may be heated. Further, a heating mechanism may be provided in the laminated web unwinding part 31 and the supporting part of the irradiating body drum 40 to heat one or both of them. 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. Placing the bonded parts of both components at an angle with respect to the direction of movement of the photoreceptor reduces the pressing force on the cleaning blade, improving cleaning performance, and is useful for peeling off the photoreceptor from the bonding area and for color separation. Peeling of members 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, a secondary latent image having a surface potential pattern corresponding to the intensity of the primary latent image is created only in the angry light layer at the bottom of the filter through which this specific light is transmitted. 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 light layer, respectively, as in FIG.
3 is a layer including the above-mentioned high-resistance three-color (El, G, R) composite filter 3a and a thin film 3b (further protective excitation depending on the case); however, in order to simplify the diagram, only the filter layer is shown. Other layers are omitted. The solvent-based adhesive layer 2 is also not shown. Further, the graphs at the bottom of each figure in FIG. 8 show the potentials on the surface of each part of the phosphor.

First, as shown in FIG. 8 [1], the charging device 4 is used to charge the angry light body 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 filter, and a corresponding negative charge is induced on the surface of 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], an alternating current or negative dead charge is applied by the charger 5 equipped with an exposure slit, and while erasing the charge on the surface of the composite filter 3, image exposure L, 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 explained using an original having only a red image as an example.

FIG. 8 [2] shows image exposure from the red image (arrows, . . . ).
) indicates the state of the part. The red light passes through the red color separation filter section 3R of the layer 3 and makes the light-absorbing layer 12 under it conductive, so that most of the positive charges on the layer 3 are erased and the photosensitive layer 12 The negative charge induced therein is 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 L, some of the positive charges on the layer 3 are erased, but the negative charges in the photosensitive layer 12 remain as they are. However, charges corresponding to the partially erased positive charges are induced in the conductive member 11. 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, -200 V. 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 produces a potential pattern in only one of the decomposition filters of the composite filter 3, for example, blue light L8 obtained by the light source 6 and the blue filter F8.

In this case, a part of the negative charge on the photosensitive layer 12 on the lower part of the decomposition filter 3 that transmits the blue light L, and the positive charge on the conductive member 1 are neutralized, as shown in FIG. 8 [3]. A negative charge remains between the layer 3 and the light-absorbing layer 12 corresponding to the portion of the resolving filter 3B, giving a positive surface potential on the composite filter 3.

As shown in FIG. 8 [4], this is developed by the developing device 7 carrying negative yellow toner T, thereby forming a partial yellow toner image of the separation filter 3B. 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), the entire surface is exposed to green light (arrow L.) obtained by the light source 9 and the green filter FG, thereby reducing the negative charge and conductivity in the angry light layer 12. The positive charges of the member 11 are neutralized, and a high surface potential shown in the lower graph is obtained in the 3G region of the layer 3.

As shown in FIG. 8 [7], magenta toner T. A magenta toner image is obtained in the 3G area by developing with the developing device 10 carrying the toner.

Next, after recharging (Fig. 8 [8]), red filters F and I
The entire surface is exposed to the red light obtained by the process, but at this time no potential pattern is generated and development with cyan toner T is not performed. Thus, when the yellow toner image and 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 has been given for the case where the original is a red image, but the three-color separation method and the subtractive method can be applied similarly when the original is a white, green, blue, yellow, magenta, cyan, or black image. Color reproduction is performed by a combination of mixed three primary color toners. FIG. S 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 (1"; J represents the formation of a primary latent image, the symbol "○" represents the formation of a secondary latent image, and the symbol "O" represents the process of each stage of toner image formation. Also, the symbol "↓" represents the process at each stage of the toner image formation. This indicates that the state of the column is maintained as it is, and a blank column indicates a portion where no latent image is formed.

FIG. 10 is a cross-sectional view of a main part of a multicolor image forming apparatus for copying multicolor images using the above-mentioned photoluminescent body 40. 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 F8.
A light source emits blue light L8, and 7 is a developing device containing yellow toner. 8 is a scorotron charger for negative DC corona discharge, and 9 is a green filter F. with green light L. 10 is a developer containing magenta toner, 14 is a scorotron charger for negative DC corona discharge, 18 is a red filter FII, and red light L.
19 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 by exposing white light or infrared light from the back of the electrode, and 54 is a cleaning blade for removing residual toner. be.

First, the photoreceptor 40 configured as described above is uniformly positively charged by the charger 4, and then negatively charged by the charger 5, and at the same time, the image exposure L from the three primary color originals of blue, green, and red is scanned and exposed. do. 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. Next, the entire surface is exposed L. by a white or blue light source 6 equipped with a blue filter F. An electrostatic charge image corresponding to the primary latent image is formed in the region of the blue separation filter, and this is developed into yellow by a yellow developer 7.

Next, after erasing the electrostatic charge image remaining in the area of the blue separation filter using the negative scorotron charger 8, the green filter F. The entire surface is exposed to light using a white or green light source S equipped with G, and developed into magenta by a magenta developing device 10.

Next, after erasing the remaining electrostatic image with the negative scorotron charger 14, the red filter F. Full exposure L. with white or red light source 18 with and cyan developer 1.
Develop cyan in Step 9.

In this way, a multicolor toner image corresponding to the original is formed on the photoconductor, 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. There is basically no difference.

Of course, if the photoreceptor can be used as an n-type or a p-type, either type 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 is the only method for forming an image using the photoreceptor. After a primary latent image is formed by image exposure, the entire surface is exposed using a three-color separation method to form a secondary latent image for each color of the color separation filters that make up the composite filter, and then developed with toner of the corresponding color. The process of charging and recharging is repeated to obtain a multicolor image.

As mentioned above, a known method is used that utilizes charges induced in the photosensitive layer, but when forming a secondary latent image by the second and subsequent full-surface exposures, the problem caused by the residual latent image from the first exposure 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.

The present invention also includes primary charging, secondary charging with a polarity substantially opposite to the primary charging, recharging for smoothing the potential pattern after image exposure, full-surface exposure with specific light, and development with specific color toner. It can also be applied to an image forming method that repeats.

The above development is preferably carried out by a magnetic brush method, and the ζ developer can be used as either a so-called one-component developer using non-magnetic toner or magnetic toner, or a so-called two-component developer that mixes toner with 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. 1983
It is particularly preferable to use the method described in each specification of No. 238296. In this method, an alternating electric field is formed in the developing area using a one-component developer consisting only of non-magnetic toner and a two-component developer containing non-magnetic toner, allowing the coloring to be freely selected. It is preferable to carry out development without bringing the developer layer into contact with the developer layer. However, a developer using magnetic toner may be used.

Color toners used for development usually consist of known binding resins used in toners, various chromatic colors such as organic and inorganic pigments and dyes, and various additives such as charge control agents.
Electrostatic image developing toners made by known techniques can be used. Examples of carriers include iron powder and ferrite powder, which are usually used for electrostatic images, and more preferably high-resistance magnetic carriers such as iron powder or ferrite coated with resin, or resin with magnetic material dispersed in it. , various known carriers can be used.

In addition, the patent application filed earlier by the applicant in 1982-24
The developing methods described in the specifications of No. 9669 and No. 58-240066 may be used.

All of the above explanations have been made regarding embodiments of color copying machines that use so-called three-color separation filters and three primary color toners, but embodiments of the present invention are not limited thereto, and various multi-color image recording Can be widely used in equipment, color photo blinking 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 GSR. 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".

one,. EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the embodiments of the present invention are not limited thereby.

Example 1 A conductive layer with a thickness of 2.3 μm made of conductive carbon (conductive carbon) and vinyl chloride-maleic acid copolymer, and a charge transport layer (CTL) with a thickness of 21.5 μm made of the following compound 1. ) and a charge generating N (CGL) with a thickness of 1 μm made of the following compound 2 were laminated in sequence on a photoreceptor, using the apparatus shown in FIG. An image carrier was produced by bonding a 2 μm thick color separation filter having the structure shown in FIG. 11 and the spectral characteristics shown in FIG. 11 on a 15 μm thick polyester film.

C t H s For joining the thin film having the above filter layer and the photoreceptor,
In this example, an adhesive having the following components was used.

Silicone 3 parts by weight High molecular weight polyester 2 parts by weight Phenol resin
4 Mica powder
8 Antioxidants
3 Alkylphenol disulfide 2 Methylene bis-4-phenol isocyanate 0.25 Next, this image carrier was installed in the image forming apparatus shown in FIG. 13, and an image was formed. In FIG. 13, the image carrier 40 was charged by the primary charger 4 so that the surface potential of the image carrier 40 was -2500V. In this case, the peripheral speed of the image carrier was 70 mm/sec.

Next, while performing image exposure, the image carrier 40 was charged with a secondary charger 5 consisting of a scorotron corona discharger having an alternating current component so that the surface potential of the image carrier 40 was +50V. During image exposure, infrared and ultraviolet light was cut off using a filter in advance.

Next, by performing uniform exposure through a blue filter, the white area of the original D is +50V and the black area of the original D is -300V.
An electrostatic image with a contrast of about 350 cm 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, magnetite was contained in the resin at a rate of 70-t%, and the average particle size was 25 μm, TJ! ? L version is 30e
mu/g, with a carrier having a resistivity of 10''Ω or more;
A developer D8 consisting of a positively charging non-magnetic toner T having an average particle size of 10I1m, which is made by adding 10 parts by weight of a benzidine derivative as a yellow pigment to a styrene-acrylic resin and other charge control agents, is added to the ratio of the toner to the developer. is 20-
It was used under conditions such that t%. Further, the outer diameter of the developing sleeve 47 of the same developing device 7 shown in FIG. is 90
0 gauss, the rotation speed is 1000 rpm, the thickness of the developer layer in the developing area is 0.3++un, the gap between the developing sleeve 47 and the image carrier 40 is 0.5 mm, and the developing sleeve 47 is supplied with a DC voltage of -100 cm. 2.0kllz, 1000
Superimposed voltage of AC voltage of V (amplitude of positive wave: station '2XIO
The non-contact development conditions were such that OO■) was applied.

Incidentally, while the electrostatic image was being developed by the developing device 7, the other developing devices 10 and 19 shown in FIG. 12, which were similarly grooved, were kept in a state in which no development was performed. It connects the developing sleeve with a power supply of 45,
This is achieved by separating the developing sleeve from 46 and placing it in a floating state, or by grounding it, 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 them,
It is preferable to apply a DC bias voltage. Further, the driving of the developing device was stopped during non-developing time. Since the developing devices 10 and 19 are also designed to perform development under the same non-contact developing 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. A developer was used whose composition was changed to a toner containing a copper phthalocyanine derivative as a cyan pigment. Of course, other pigments or dyes may be used as the color toner, and the order of developing colors may be appropriately determined so as to obtain a clear color image. In particular, the order of developing colors may be related to the sharpness of the color image and the potential contrast that can be obtained, so it must be carefully determined.

The surface of the image carrier 40 developed by the developer 7 was recharged to a surface potential of +90 cm by a scorotron corona charger, and then uniformly exposed to light through a green filter. The potential of the electrostatic image thus obtained was +70V for the white background and -250V for the black background. This electrostatic image was transferred to a developing sleeve with a DC component of +5V and an AC component of 2.0kHz.
Developing was carried out in the developing device 10 under the same conditions as in the developing device 7 except that a voltage of 1000 V was applied.

Similarly, the scorotron charger increases the surface potential to +110
After being recharged to V, uniform exposure was performed through a Lenod filter. As a result, an electrostatic image of +95V for the white background and -200V for the black background is formed, and this electrostatic image is applied to the developing sleeve with a DC component of +40V and an AC component of 2.0 kllz.
, IOOOV was applied, but under the same conditions as in developer 7, development was performed in developer IS.

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 fixing device 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 or infrared light, residual toner is removed from the surface by the cleaning blade 54 of the cleaning device 22, and the color image is formed. When the surface passes through the cleaning device 22, one cycle of color image recording is completely completed.

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

(Margins below) As the image carrier 40, a 60 μm thick film having spectral characteristics as shown in FIG. 14 is placed on a Ni substrate.
3 and has the structure shown in Figure 4 (B) and the first
A 2 μm thick color separation filter having the spectral characteristics shown in FIG. 1 was bonded to a 15 μm thick polyester film. 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 rotational linear speed was 120 mm/sec.

In this example, a thin film and a sheet-like photoreceptor were attached, and sufficient adhesive strength was obtained.

(Leaving space below) Table 2 Examples 1 and 2 are examples in which a thin film having a filter layer is attached to a sheet-like photoreceptor, but in this Example 3, a release treatment is applied to the thin film side. A composite filter layer was printed in the same manner as above on the web, which had been subjected to the following steps to stop the mold release treatment on the support side so that the adhesive remained on the support side during peeling, to create a laminated wesop.

Using the apparatus shown in FIG. 7, the thin film having the filter layer was peeled off from the laminated webbing, cut into an appropriate size, and then sent to a photoreceptor drum. An adhesive was applied to the photoreceptor drum by dipping in advance. In this example, the adhesive was heated by an external heating device to melt the adhesive and give it a positive adhesive property. There, the thin film with the cut filter layer was moved and adhered to the photoreceptor drum. The support from which the thin film had peeled off and the adhesive layer was attached was wound up to a support winding section.

The obtained photoreceptor has the structure shown in FIG. 1(C). As shown in Figure 1 (C), there is an adhesive method in which a filter layer is installed on the side of the photoreceptor, 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,
It is desirable to pre-coat the photoreceptive layer.

In this example, when attaching the thin film to the photoreceptor drum, the thin film must be attached instantly when the adhesive is applied to the photoreceptor drum.

Northern Comparison ■ The adhesive used in Examples 1 to 3 is water-insoluble, but in this comparative example, a water-soluble adhesive (e.g., casein) was used to adhere the filter, and the filter was similarly used for 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 present invention to bond the photosensitive layer and the filter layer.

[Brief explanation of drawings]

The drawings are for illustrating and explaining the present invention, and FIGS. 1(A), (B), (C), (D), (E), and (F) are partial cross-sectional views of various photoreceptors. , Fig. 2 is a partial cross-sectional view of a state in which a thin film is provided on a support, Fig. 3 (A) and (B) are cross-sectional views of a laminate having a composite filter, and Fig. 4 (A) and (B). ) and (C) are partial plan views showing various patterns of the filter; Fig. 7 is a schematic diagram showing the process of adhering the filter layer to the photoreceptor; Fig. 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 symbols shown in the drawings, 1-1 to support 2, + 3--
--------- Adhesive layer 3 a-----1・----1--Filter layer 3b 1-----・-----11 Thin film 3c----- ----Protective layer + 1--Conductive member 12-----1. Photosensitive layer. Agent Patent Attorney Hiroshi Aisaka Figure 2 Figure 3 Figure 1 Figure 4 Figure 5 Figure 5 4/@8 Figure 11 Figure 1 & (nm) Figure 12 冫平-j (rlm)

Claims (1)

[Claims] 1. A photoreceptor in which a layer having a color separation function is attached to the upper side and/or the lower side of the photosensitive layer using a solvent-based adhesive.