JPS62266549A - Photosensitive body - Google Patents

Abstract

PURPOSE:To enable the relatively easy adhesion especially of a filter layer to 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 a vinyl plastisol 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 a vinyl plastisol adhesive. Though an ordinary blend of vinyl plastisol does not adhere to metals, an adhesive for metals having high toughness and superior wear resistance is obtd. by adding a silane adhesion accelerator or other component. 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 a vinyl plastisol adhesive 2.

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 image is transferred to recording paper. Also,
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, which is sequentially transferred to recording paper. There is a method and apparatus.

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

As a solution to these shortcomings, a patent application filed in 1986-18
No. 5440, No. 59 187044, No. 59-199
No. 547, Specification 8 of No. 60-229524, etc.
A composite filter consisting of multiple types of microfilters of different colors arranged in a mosaic pattern is placed above the photosensitive layer (the side to which toner will adhere during development) or below (the side to which toner will not adhere during development). An image forming method using a photoreceptor having the following has been proposed. According to this method, after image exposure is given through a composite filter bonded to the photoreceptor, the entire surface is exposed to a specific light to form an image, developed with a specific color toner, and smoothed by recharging. Since a multicolor image is formed on the photoreceptor by changing the filter type process, it has the advantage of requiring only one image exposure and no need for alignment. You can get quality multicolor images.

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 the technology 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.

The photoreceptor used in this image forming method has
For adhesion between the photoconductor and the insulating layer, Dainippon Ink &Chemicals' polyester film laminating adhesive E is used as the main agent.
An adhesive prepared by mixing PS-623 and a hardening agent KN40 in a ratio of 5:1 and further diluting the adhesive twice with methyl ethyl ketone is used (Japanese Patent Application Laid-Open No. 16645/1982).

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 unsatisfactory.

The adhesive used must have the following various properties, but no adhesive has yet been proposed that satisfies these requirements (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 during curing is small (if it is too thick, bubbles will occur and the image in this area will be disturbed).

(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 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 blurry).

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

In other words, in the present invention, a layer having a color separation function (hereinafter referred to as a color separation layer or a color separation member) is formed of vinyl plastisol on the upper side and/or lower side of the photosensitive layer. This relates to a photoreceptor that is bonded via an adhesive.

According to the present invention, a specific adhesive is used for adhering the color separation layer (particularly the color separation member such as the mosaic filter mentioned above), namely the vinyl plastisol adhesive described above (hereinafter referred to as the adhesive of the present invention). ), this conventional formulation of vinyl plastisol does not adhere to metal, but the addition of silane adhesion promoters and other ingredients provides a tough, abrasion-resistant metal adhesive. For example, usually 1
Heat to 77°C or higher and cure in 60 minutes. This adhesive is suitable for the present invention because it does not affect the photoreceptor under these moderate conditions.

Next, this vinyl plastisol and this tin 4i
Figure 2 illustrates the effect of silane adhesion promoters on adhesion.

Compound: Vinyl dispersion resin CUCCQYOV) 100
Part 100 Phenol resin (UCCBKPA-5904
) 25 parts - plasticizer (UCCFa ol 1
0 10) 65 parts 65 Epoxy resin (U'CCUnox 289) 10 parts - "Duramite" (Duramite) 100 parts 100 "Dyphos"
” (Stabilizer) 2 parts 2A-112
0 (UCC adhesion promoter) -O,S
Tensile adhesive strength kg/cm”) (Adhesive area 1i1
, adhesive layer thickness 31, curing conditions 60 minutes/I77°C): cold rolled steel - cold rolled steel 456
5 In this way, by providing the color separation layer on the photoreceptor via an adhesive, it is possible to adhere the photosensitive layer and the filter layer relatively easily, and since poly-7- is used, In addition, since the polymer, solvent, and curing agent can be selected relatively freely, it is possible to choose one that will not contaminate the photoreceptor or filter layer.

Similarly, the emission spectrum of image exposure (main wavelength 450 nm
, 550 nm, 650 nm, etc.) can be selected. It is thought that when a water-insoluble adhesive is used, the amount of charge trapped at the interface between the photosensitive layer and the adhesive layer is higher than when the adhesive layer is not used.

In addition to the function of bonding 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 bonding the photosensitive layer and the filter layer. As the thickness of the tangent 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 having a filter layer that has excellent abrasion resistance and does not deteriorate its 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 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, a film-like web having appropriate hardness and flexibility, such as various plastic films such as polyethylene terephthalate, polycarbonate, polystyrene, polyethylene, and triacetate, is preferably used. The thickness of these supports varies depending on the properties of the material, but is approximately 100 μm.
It is preferable to set it as approximately.

An adhesive layer is provided between the support and the thin film for forming 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 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. Also, when the thin film is provided on the photosensitive layer,
Although it is preferable to have a specific resistance value of 10'3 Ω to cm 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, the adhesion between the thin film and the adhesive layer is higher than the adhesion between the adhesive layer and the support (if this is done, the adhesive layer will adhere to the thin film side and peel off when peeled off, and the strength relationship of the adhesion will be reversed). For example, 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 a support, 2 is an adhesive layer, and 3h 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. It is preferable to make it insoluble in solvents 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 a solvent 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. Further, for green filters, organic dyes or pigments such as brilliant green, malachite green, naphthol green, etc. are used, and for red filters, organic dyes or pigments such as tsuksin, phenosafranin, rhodamine B1 naphthol red, etc. are 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, 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 operation for the type of filter you need, you can create the required 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 this, the filter layer will be protected from wear, scratches, and damage during use.
It can protect against ozone generated during charging, image exposure, etc. FIG. 3(A) is a cross-sectional view of the web consisting of the support 1, the adhesive layer 2, and the thin film 3b after printing the composite filter layer, in which 3a is the filter layer, R, G, B shows red, green, and blue filters, respectively. In FIG. 3(B), a protective layer 3C is further applied on the filter layer.

For the above reasons, it is preferable to use a 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 Fig. 4 (B) and (C) is used, and the size of each filter is 30% as the color repetition width (β1.42g in Fig. 4).
It is preferable to set it as 500 Iim.

If the size of the filter is too small, it will be difficult to obtain or create other adjacent color image densities. 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. Note that FIGS. 3(8) to 3(B) and FIGS. 4(A) to 4(C) all show cases in which 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 B 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. It is possible to get ゛−′−−1, −1.

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 dispersing an organic photoconductor such as polyvinylcarbazole, polyvinylanthracene, polyvinylpyrene, polycyclic quinone dye or pigment, disazo dye or pigment, or dispersing it in a resin and then coating it. Such binder resins include polyethylene, polyester, polypropylene, polystyrene, polyvinyl chloride, polyvinyl acetate,
Examples include insulating and translucent resins such as 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. Examples of conductive substrates include metals such as aluminum, iron, nickel, copper, and stainless steel, alloys thereof, or thin films of these metals provided on polyester terephthalate films, etc., by methods such as lamination or vapor deposition. ,usually,
Various known substrates 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 including 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 peel off after adhering to the photoreceptor surface, but the filter layer side may be adhered to the photoreceptor surface (or the back side of the thin film (i.e., the adhesive layer side before 11 AI) may be attached to the photoreceptor surface. If the adhesive layer remains on the support side when it is peeled off, the adhesion method may include coating or spraying the adhesive of the present invention on the photoreceptor surface or thin film side. The thin film may be uniformly adhered by a method and the desired surface of the thin film may be pressed.

In addition, if the adhesive layer is to be attached to the thin film side and peeled off during peeling, the adhesive layer is formed in advance with the adhesive of the present invention described above, and the adhesive layer surface of the peeled thin film is directly applied to the surface of the photoreceptor. It can be attached directly to the If you want to attach 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 then affix the filter layer side of the thin film to the photoreceptor surface. , 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 a thin film to a photoreceptor, 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)
), blue (B) color separation filter), and a layer 3 consisting of a thin film 3b are bonded together with the adhesive 2 of the present invention described above. Reference numeral 13 denotes the above-mentioned adhesive layer of the present invention that adheres the thin film 3b having the filter layer 3a and the surface of the photoreceptor. FIG. 1(A) shows an example in which the 1 film 3b side is adhered to the photoreceptor surface, and FIG. 1(B) shows an example in which a protective layer 3c is previously provided on the filter layer but the thin film 3b side is adhered to the photoreceptor surface. Figure 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.
D) is an example of a photoconductor in which a protective layer 3c is previously provided on a filter layer 3a, and the protective layer 3c side is adhered to the photoconductor 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 or structure as required, such as a cylindrical shape or an endless heald 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 in FIG. 1(C) is
Since the filter layer 3a is present on the photosensitive layer 12 side, there is no image blurring due to light scattering, which is relatively advantageous.

In addition, the adhesive of the present invention can be applied to thin fi 3b or filter layer 3a.
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 quite high, the photosensitive layer 12 can be adhered. The temperature of the photosensitive layer does not rise appreciably during adhesion to the layer. Therefore, depending on the temperature at the time of melting, the weight of the photosensitive layer increases.
It is possible to effectively prevent the adverse effects (for example, crystallization in selenium systems) experienced by

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, as shown in Figure 1 (E).
1(F) shows a layer in which 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, and FIG. (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 vapor deposition or sputtering 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, first, as in No. 511 (A), the conductive member 11
A photosensitive layer 12 is formed thereon, and the adhesive layer 2 of the present invention is coated uniformly on a release film 16 in advance using a roll coater, and then superimposed on the photosensitive layer 12 as shown by an arrow 17. Then, as shown in FIG. 5(B), they are pressed and completely integrated. Furthermore, as shown in FIG. 5(C), the release film 16 is peeled off and the adhesive N2 of the present invention is transferred onto the photosensitive layer 12. After that, the filter layer 3 is formed as described above.
a are overlapped and adhered to the photosensitive layer 12.

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. 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, the photosensitive layer 12 is
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, even if the temperature of the adhesive is quite high, 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 J'i 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 vat containing adhesive 2, and 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 regulated by a doctor 38. In the laminated web, the filter layer surface is pressed onto the surface of the photoreceptor coated with 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. The shaped photoreceptor is wound up by a 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. 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 the photoreceptor from the bonding part 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 charged with a primary charge, then a secondary charge is applied.
Next, charging and simultaneous image exposure are performed 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 has passed is formed with a secondary latent image having a strength or weakness of surface potential corresponding to the intensity of the second layer image, that is, a potential pattern. Forms calyx. This secondary latent image is developed with toner having a complementary color to that of the filter.

Thereafter, recharging is performed to smooth the surface potential to prevent color mixing on the toner image on the photoconductor, full-scale exposure to specific light is performed to form a potential pattern in the next separation filter section, and the relationship between the filter and complementary colors is determined. By repeating the development process with a certain toner, 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. Figure 8 [1] to [8]
1 is a schematic representation of a portion of a photoreceptor using an n-type semiconductor such as cadmium sulfide as a photosensitive layer, and the image forming process therein. 11.1 in the diagram
2 is a conductive member and a photosensitive layer, respectively, as shown in FIG. However, in order to simplify the diagram, only the filter layer is shown and other layers are omitted. Adhesion N2 of the present invention is also omitted from illustration. Further, the graphs at the bottom of each figure in FIG. 8 show the potentials 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. by this,
A positive charge is generated on the surface of the layer 3 containing the composite filter, and a corresponding negative charge is induced at the interface between the photosensitive layer 12 and the layer 3 containing the filter, resulting in the state shown in FIG. 8 [1].

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 electric charges on the surface of the composite filter 3, and image exposure Lr from the multicolor original is applied. . 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 image exposure from the red image (arrow L
The state of the part where r) has been applied is shown. The red light Lr passes through the red color separation filter part 3R of the layer 3 and makes the photosensitive layer 12 below it conductive, so that most of the positive charges on the layer 3 are erased and the photoreceptor [12 The negative charges induced by the above 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 Lr, some of the positive charges on the layer 3 are erased, but the negative charges in the photosensitive layer 2 remain as they are. , and a charge corresponding to the partially erased positive charge is 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, -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], a specific light that causes a potential pattern only in one type of decomposition filter of the composite filter 3,
For example, the entire surface is exposed to blue light obtained by the light source 6 and the blue filter F1.

In this case, a part of the negative charge of the photosensitive layer 2 under the decomposition filter 3B that transmits the blue light L8 and the positive charge of the conductive member 1 are neutralized, and the decomposition occurs as shown in FIG. 8 [3]. Filter 3
A negative charge remains between the layer 3 corresponding to the portion B and the photosensitive layer 12, and a positive surface potential is given to the composite filter 3.

As shown in FIG. 8 [4], by developing this with the developing device 7 carrying negative yellow toner TV, a partial yellow toner image of the separation filter 3B is formed. In the area of the separation filter 3B where this yellow toner image was formed, the surface potential remains unsaturated by the toner, so as shown in the lower graph, a relatively high surface potential remains. , there is still room for another toner to adhere during the next step of development.

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 9 and the green filter Fc, the negative charges in the photosensitive layer 12 and the four-electrode The positive charges of the member 11 are neutralized, and a high surface potential shown in the lower graph is obtained in the region of the layer 303G.

By developing this with a developing device 9 carrying magenta toner T, as shown in FIG. 8 [7], a magenta toner image is obtained in the 3G area.

Next, after recharging (Fig. 8 [8]), the entire surface is exposed to red light obtained by the red filter F, but at this time no potential pattern is generated and development with cyan toner T is not performed. do not have. In this way, the yellow toner image and magenta toner image are obtained.

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 applied 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. Symbol r',]": J is primary latent image formation, symbol "
0" represents the formation of a secondary latent image, and the symbol "0" represents the process of each stage of toner image formation. Further, the symbol "↓" indicates that the state in the upper column is maintained as it is, and the blank column indicates a portion where no latent image is formed.

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.
40, the film-like photoreceptor 1 is placed on the metal drum 11;
2 (further polishing 3), 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 that emits blue light, and 7 a developing device containing yellow toner. 8 is a scorotron charger for negative DC corona discharge, 9 is a light source that includes a green filter Fa and irradiates green light LG, 10 is a developing device containing magenta toner, and 14 is a scorotron charger for negative DC corona discharge. , 18 is a light source that has a red filter FR and emits red light LR, and 19 is a developing device containing cyan toner. P is a recording paper, 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 of the electrode to white light, and 54 is a cleaning blade for removing residual toner.

First, the photoreceptor 40 configured as described above is uniformly positively charged by the charger 4, and then negatively charged or AC charged by the charger 5. At the same time, an image from the three primary color originals of blue, green, and red is applied Scan exposure.

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 Ls by a white or blue light source 6 equipped with a blue filter FB to form an electrostatic charge image corresponding to the next layer image in the area of the blue separation filter, and this is transferred to a yellow developing device 7 to produce a yellow image. develop.

Next, after erasing the electrostatic charge image remaining in the region of the blue separation filter by a negative scorotron charger 8, the entire surface is exposed LG by a white or green light source 9 equipped with a green filter FG, and a magenta developer 10 Develop magenta.

Next, after erasing the remaining electrostatic image by the negative scorotron charger 14, the white light source 1 equipped with the red filter F
The entire surface is exposed using 8, and 1 is applied, followed by cyan development using a cyan developer 19.

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, 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. After a primary latent image is formed by exposure, the entire surface is exposed using the 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. , and the steps of recharging are 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 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 in which the surface potential obtained when charging becomes 0 or the surface charge disappears.

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

The above development is preferably carried out by a magnetic brush method, and the developer used is 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 directly rubbing with a magnetic brush may be used, but especially after the second development, a developing method in which the developer layer does not come into contact with the photoreceptor surface is used to avoid scratches on the formed toner image. Therefore, the gap between the developing sleeve and the photoreceptor is set larger than the thickness of the developer layer on the sleeve (
However, if there is no potential difference between the two, the developing method used, for example, U.S. Pat.
Publication of Japanese Patent Application No. 58-238295, Japanese Patent Application No. 58-23
It is particularly preferable to use a method such as that described in each specification of No. 8296. This method uses a one-component developer consisting of only non-magnetic toner and a two-component developer containing non-magnetic toner, which can be colored freely. It is preferable to carry out development without bringing the agent layer into contact with each other. However, a developer using magnetic toner may be used. The color toner used for development usually contains a known binding resin used for toner,
It is possible to use toners for electrostatic image development made by known techniques, which are made of various chromatic colors such as organic and inorganic pigments and dyes, and various additives such as charge control agents. 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 magnetic materials dispersed in resin. , various known carriers can be used.

In addition, the applicant previously filed the patent application No. 58-2496.
69 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 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 G, B, 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.

1. Ketjen blank (conductive carbon) and vinyl chloride
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.

Compound 1: 2H8 Compound 2: In this example, a vinyl plastisol adhesive containing a silane adhesion promoter was used as the adhesive for bonding (adhesion) between the thin film having the above filter layer and the photoreceptor. there was.

The photoreceptor wound up on the photoreceptor winding section was placed in a high temperature bath and heated at 180'C for 60 minutes. This cured the adhesive.

Next, the above-described image carrier was incorporated into an image forming apparatus shown in FIG. 12, and an image was formed. In Figure 12,
The image carrier 40 was charged by a DC scorotron corona discharger 4 while the image carrier 40 was primarily charged with a 2S4 lamp and the device light was applied so that the surface potential of the image carrier 40 was 11800 μm. The circumferential velocity of the body is 70ml1/s
It was set as ec.

Next, while performing image exposure, a secondary charger 5 consisting of a scorotron corona discharger having an AC component is used to charge the image carrier 40
It was charged so that the zero surface potential was +30V. During image exposure, infrared and ultraviolet light was previously canted with a filter.

Next, by uniformly exposing the light through a blue filter, the white part of the original paper is +30V, and the black part of the original paper is -32V.
An electrostatic image was formed with a contrast of about 350V of 0. 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&4t% magnetite was dispersed in the resin, the average particle size was 25μm, and the magnetization was 30emu/
A carrier with a g-1ie resistivity of 10" Ω-cm or more; and a positive charging non-( II (a developer De consisting of a toner T with a toner ratio of 20
-t%. Further, the outer diameter of the developing sleeve 47 of the developing device 7 shown in FIG. 13 is 30 mm.
, the number of rotations in the direction of arrow B is 100 rpffl, 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 number of rotations is 11000 rp, and the thickness of the developer layer in the developing area is 0. 3 gates, developing sleeve 47 and image carrier 4
0, and the developing sleeve 47 has a gap of -1.
The superimposed voltage of 00V DC voltage and 2.0KH2,1000V AC voltage (the amplitude of the construction wave is f'×1000V
) was applied under non-contact development conditions.

Incidentally, while the electrostatic image was being developed in the developing device 7, the other similarly configured developing devices 10 and 19 in FIG. 12 were kept in a non-developing state. It is possible to replace the developing sleeve with an electric rX4
5.46 to be separated from it and placed in a floating state;
Or do you ground it, or actively supply the developing sleeve with a high DC current of the same polarity as the electrostatic image (i.e., the opposite polarity to the toner charge)? This is achieved by applying a bias voltage, and it is particularly preferable to apply a DC bias voltage.
Further, the driving of the developing device was stopped during non-developing time. Developer 1
Since 0.19 is also developed 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 of the developer in the developing device 7 is changed to a toner containing polytan dust phosphoric acid as a magenta pigment instead of a yellow pigment. A developer was used in which the composition was changed to a toner containing copper phthalocyanine aM'R 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 developing colors may be related to the sharpness of the color image and the potential contrast that can be obtained, and therefore needs to be carefully determined.

After the surface of the image carrier 40 that had been developed by the developer 7 was recharged to a surface potential of +110 V by a scorotron corona charger, it was uniformly exposed to light through a green filter. The potential of the electrostatic image obtained in this way is +7
For 5V, the black area was -250cm. This electrostatic image is transferred to a developing sleeve with a DC component of IOV and an AC component of 2.
Developing was carried out in developer IO under the same conditions as in developer 7 except that a voltage of 0 kHz and LOOOV 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 -210V on the black background is formed with respect to +90V on the white background, and this electrostatic image is applied to the developing sleeve with a DC component of +50V and an AC component of 2.0 kH.
Development was carried out in developer 19 under the same conditions as in developer 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, one cycle of color image recording was completely completed.

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

(The following is a margin, continued on the next page.) As an image carrier 40, a 60 μm thick Aszsei photosensitive layer exhibiting spectral characteristics as shown in FIG.
A 2 μm thick color separation filter having the structure shown in FIG. 4(B) and the spectral characteristics shown in FIG.
A material provided on a 5 μm polyester film and bonded was used. The adhesive used was the same as in Example 1. Image formation similar to Example 1 was carried out 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 195 mm/
It was sec.

(The following is a margin, continued on the next page.) 111 Running Example 1.2 is an example in which a thin film having a filter layer is attached to a sheet-like photoreceptor, but in this practical 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.

'! shown in Figure 7! The thin film having the filter layer was peeled off from the laminated web at A position, cut into an appropriate size, and then sent to a photoreceptor drum. Adhesive was attached to the photosensitive drum by rough dipping and pinging.

In this example, the photosensitive drum to which the color separation member was attached was placed in a high temperature bath at 180° C. for 60 minutes to cure the adhesive. The photoreceptor drum or membrane was not heated.

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 photoreceptor surface side as shown in Figure 1 (C), and a thin film with a filter layer is installed in Figure 1 (C).
Method of adhering on the opposite side to C) (Figure 1 (A):
Separate the photoreceptor surface and filter layer. ). but,
Preferably, it is preferable to bond as shown in FIG. 1(C). The reason for this is that it is resistant to wear and damage during use, and 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 FIG. 1(B) is preferable.

The adhesive used in Examples 1 to 3 was non-water soluble, but in this comparative example, a water soluble adhesive (e.g. casein) was used to adhere the filter and image formation was performed in the same manner. provided.

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 abrasion resistance, the charge 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 having a polarity opposite to the primary charged 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 the drawing]

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; Figures 5 (A), (B) and (C) are partial cross-sectional views of the main stages showing other bonding methods; Fig. 7 is a schematic diagram showing the process of adhering the filter layer to the photoreceptor; Fig. 8 [1], C2), [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. Cross-sectional view of the forming device, first
FIG. 1 is a spectrum 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・・−・−・Adhesive layer 3a・−・・−−1−−
------Filter layer 3b-----・-----m
-Thin film 3cm...--1----Protective layer 11...
−・−・−−−−−1−−−・−・Conductive member 12−−
-1.-- Photosensitive layer. Agent Patent Attorney Hiroshi Aisaka Figure 2 Figure 3 ㅅ Figure 4 Figure 5 Figure 6 Figure 7 Figure 11 ) (Voluntary) Procedure Ne1u Right and Wrong October 11, 1988 Patent Office District Officer Black 1) Akio Yu Tono1, Indication of the case 1986 Patent Application No. 1103162, Name of the invention Photoconductor3, Amendment Relationship with 11 patent applicants Address: 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name:
(127) Konishiroku Photo Industry Co., Ltd. 4, Agent address: FINE Building 6, 2-4-11 Shibasaki-cho, Tachikawa-shi, Tokyo, Number of inventions increased due to amendment 7.1 Inventions in the '91811 book subject to city approval 7) A'P Ml f&explanation column), omitted τ7 (1), "acetimon" on page 15, line 6 of the specification is changed to "7".
"Nchimon," I corrected myself. (2), p. 45, line 3, rAs2se3J is [A of
I will correct it as s25e3j. -That's all-

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 a vinyl plastisol adhesive.