JPS636568A - Photosensitive body - Google Patents

Abstract

PURPOSE:To stabilize an attached layer by attaching a layer having a color separation function to the upper or lower side of a photosensitive layer with a hot melt type adhesive. CONSTITUTION:The photosensitive body 40 is obtained by forming the photosensitive layer 12 on a conductive member 11 made of Al or the like, and the desired color separating layer 3 consisting of a composite filter layer 3a composed of fine necessary color separating filters, such as red (R), green (G), and blue (B) color separating filters, and a thin film 3b is attached to the upper or lower side of the photosensitive layer 12 with the hot melt type adhesive layer 2 using no solvent. There are 2 types of hot melt coaters; a roll type and a fountain coater type, and since the adhesive layer 2 uses no solvent and the photosensitive layer 12 is not affected by heating temperature, the layer 2 is suitable for attaching the thin film 3b having the filter layer 3a to the photosensitive body 40, thus permitting the photosensitive layer 12 to be brought into especially close contact with the filter layer 3a comparatively easily and the attached layer to be stabilized by forming the layer on the adhesive layer 2 attached to the photosensitive layer 12.

Description

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

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

For example, there is a multicolor image forming method and apparatus in which each time a toner image of each color is formed on an electrophotographic photoreceptor by image exposure and development according to each color separated light, the toner image is transferred to a transfer material. 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 a transfer material. 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. Furthermore, the latter method and apparatus uses a plurality of photoreceptors in parallel, so although it is advantageous in terms of high speed, it has drawbacks such as making '21 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 a solution to these shortcomings, a patent application filed in 1986-18
No. 5440, No. 59-187044, No. 59-199
No. 547, specification No. 60-229524, etc.,
A composite filter layer in which multiple types of microfilters with different colors are arranged in a mosaic pattern is provided above the photosensitive layer (the side to which toner adheres during development) or below (the side to which toner does not adhere during development) the photosensitive layer. An image forming method using a photoreceptor has been proposed. According to this method, after image exposure is given through a composite filter adhered to the photoreceptor, R, C
;, The entire surface is exposed to the specific light B, and an electrostatic image corresponding to the light transmitted through the filter is formed on a portion of the composite filter corresponding to the specific filter, and developed using a toner of a specific color. However, the process of smoothing by recharging is repeated for each type of filter to form a multicolor image on the photoreceptor, which has the advantage of requiring only one image exposure and eliminating the need for alignment. , it is possible to obtain high-quality multicolor images with minimal space.

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 a photoreceptor, which is relatively fragile but must be extremely smooth and free of defects such as scratches, will not produce good results; It was also accompanied by many technical 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 bonding between the photoreceptor and the insulating layer, Dainippon Ink &Chemicals' polyester film laminating adhesive base agent EPS-623 and curing agent KN are used.
-40 in a ratio of 5:1 and further diluted to 2 times with methyl ethyl ketone (Japanese Patent Application Laid-Open No. 48
-16645).

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.

That is, the adhesive used is required to have the following various performances, but no adhesive that satisfies these has 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) is 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 disturbed).

(3) Use an adhesive made of a material that does not release water during curing.Also, 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).

26. OBJECTS OF THE INVENTION An object of the present invention is to provide a photoreceptor to which color separation members (layers) are 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 provided on the upper side and/or the lower side of a photosensitive layer using a hot-melt layer. This relates to a photoreceptor that is attached using a type adhesive.

According to the present invention, a specific adhesive, that is, a real melt adhesive, is used to attach the color separation layer (particularly, the color separation member such as the mosaic filter mentioned above). This adhesive has attracted attention for its pollution-free, resource-saving, and high-speed properties.

The development of hot melt adhesives owes much to the development of block copolymers. Block polymers are especially made up of end blocks of styrene moieties and midblocks of rubbery moieties such as butadiene or isoprene.
Tackifier resins with good compatibility with rubber parts lower viscosity and increase tack and adhesive strength, but tend to reduce cohesive strength. Oil also reduces viscosity and helps improve tack.

Naphthenic or paraffinic oils with low aroma content may be used. Aromatic oils tend to interact with the polystyrene domains and significantly reduce strength.

Profuku polymers with unsaturated rubbery parts are prone to deterioration, and deterioration due to heating is a particular problem, so sufficient care must be taken during the actual manufacturing process. To prevent this, mix for as short a time as possible and reduce the heating temperature to 1.
The temperature should be kept below 50°C, air heating should be avoided as much as possible, anti-aging agents should be selected, and inert gas should be used.

Hot melt adhesives are solvent-free adhesives.

There are two types of hot melt coaters for making adhesive sheets using this adhesive: a roll type and a fountain coater type. The gravure coater method is suitable for thin and accurate coating. Furthermore, since the adhesive does not come into direct contact with air, it is less susceptible to deterioration, so it is preferable to apply the adhesive using a gravure coater method.

In order to avoid heat shrinkage of the thin film having the filter layer due to the heat of the melted Honmelt, it is preferable to apply the coating to the photoreceptor side.

A hot melt adhesive is suitable for attaching a thin film having a filter layer to a photoreceptor because it is solvent-free and the heating temperature does not affect the photoreceptor. Moreover, this adhesive has a uniform and stable adhesion layer, and has good transparency, insulation properties, and the like.

Therefore, it is very advantageous to realize the object of the present invention.

In this way, by providing a color separation layer on the photoreceptor via an adhesive, it is possible to adhere the photosensitive layer and filter layer relatively easily, and since it uses a polymer, it has high insulation properties. Also, you can choose one that 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 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 attaching a photosensitive layer and a 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 hot melt adhesive to the upper or lower side.

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 limited to 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 the thin film is subjected to alH 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 10I3Ω-0111 or more, no particular limitation is required when it is provided below the photosensitive layer.

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

In the former case, the adhesive layer may be formed from the above-mentioned hot melt 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 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 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. As such a coloring agent, for example, an organic dye or pigment such as copper phthalocyanine, methylene blue, cyanine blue, Victoria blue, etc. is used for a blue filter. 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 N in thickness from 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. FIG. 3(A) is a cross-sectional view of the web consisting of the support 1, the adhesive N2, and the thin film 3b after printing the composite filter layer, where 3a is the filter layer and R, G, B indicate 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 the photoreceptor having the structure (B).

The shape and arrangement of the color separation filters constituting the above-mentioned composite filter and the ratio of the number of individual microfilters constituting the composite filter are not particularly limited. If the body is drum-shaped, lines that 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 Figure 4 (B) and (C) is used, and the size of each filter is determined by the color repetition width (11, I!2 in Figure 4). 30
It is preferable to set it as 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, FIGS. 3(A) to (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. be able to.

The photoreceptor according to the present invention has a photoconductive layer provided on a conductive substrate, and the photosensitive layer is made of sulfur, selenium, amorphous silicon, or an alloy of these with tellurium, arsenic, antimony, etc. or inorganic photoconductors of oxides, iodides, sulfides, and selenides of metals such as zinc, aluminum, acetimone, bismuth, cadmium, and molybdenum, or in a binder resin. Formed by dispersion coating. Additionally, organic photoconductors such as vinylcarbazole, anthracenephthalocyanine, trinitrofluorenone, polyvinylcarbazole, polyvinylanthracene, polyvinylpyrene, polycyclic quinone dyes or pigments, disazo dyes or pigments are similarly vapor-deposited or resin-dispersed and then applied. It is formed by Such binder resins include polyethylene, polyester, polypropylene,
Examples include insulating and translucent resins such as polystyrene, polyvinyl chloride, polyvinyl acetate, polycarbonate, acrylic resin, silicone resin, fluororesin, and epoxy resin. Furthermore, a functionally separated photoconductor having a charge generation layer and a charge transfer layer is also used. 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. 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. Alternatively, the back side of the thin film (ie, the adhesive layer side before peeling) may be adhered to the surface of the photoreceptor.

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 true melt adhesive on the photoreceptor surface or thin film side to make it adhere uniformly, and then form the thin film. All you have to do is press the required surface. In addition, if the adhesive layer is to be attached to the thin film side and peeled off during peeling, the adhesive layer can be formed in advance with the above-mentioned true melt adhesive, and the adhesive layer side of the peeled thin film can be directly applied to the photoreceptor surface. It can be attached directly to the When attaching the thin film to the photoconductor surface with the adhesive layer still attached, with the filter layer side facing outward, apply the adhesive to the photoconductor surface or the filter layer side of the thin film, and then affix the filter layer side of the thin film to the photoconductor 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 adhesives as those 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 prepared as described above, in which a photosensitive layer 12 is provided on a conductive member 11, and a photosensitive layer 12 is provided on the photoreceptor layer 12, and the desired photoreceptor 40 prepared by the method described above is provided on the photosensitive layer 12. fine color separation filter (in the case of the figure, red (R), green (G)
), a blue (B) color separation filter) group, and a layer 3 consisting of a thin film 3b are adhered with the above-mentioned hot melt adhesive 2. 13 is the filter layer 3
This is the above-mentioned hot-melt adhesive layer that adheres the thin film 3b having the surface of the photoreceptor to the surface of the photoreceptor. FIG. 1(A) shows the thin film 3b.
An example in which the side of the thin film 3b is adhered to the photoconductor surface, and FIG. 1(B) is 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 photoconductor surface, and FIG. 1(C) is an example in which the filter layer 3a
An example in which the filter layer side of the layer consisting of and thin film 3b is adhered to the photoreceptor surface, FIG. 1(D) shows a photoreceptor in which a protective layer 3C is previously provided on the filter layer 3a, but the protective layer 3c side is adhered to the photoreceptor surface. This is an example of a body.

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

In the above, the configuration in which the protective layer 3C or the thin film 3b is present on the surface (FIGS. 1B, 1C, and 1D) is desirable from the viewpoint of durability and rigidity. 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.

Furthermore, the adhesive of the present invention can be applied onto the photosensitive layer 12 while being applied to the thin film 3b or filter layer 3a, but in this case, by reducing the heat capacity of the thin film 3b and filter layer 3a, E7) Even if the temperature of the melt adhesive is quite high, the temperature of the photosensitive layer does not rise much when it is attached to the photosensitive layer. Therefore, it is possible to effectively prevent the photosensitive layer 12 from being adversely affected by the temperature at the time of melting (for example, crystallization in selenium).

The present invention can also be applied to photoreceptors in which a filter layer is provided below the photosensitive layer. The image forming method using this photoreceptor is described in Japanese Patent Application No. 59-199547, and uses a photoreceptor having an insulating layer, a photosensitive layer, and a transparent conductive member, and is charged with secondary and secondary charging. It is characterized in that image exposure and full-surface exposure with specific light are performed from the filter side on the back side. Figure 1 (
E) and (F) are examples of this type of photoreceptor, as shown in Figure 1 (E).
1(F) shows the thin film side of the layer consisting of the thin film 3b and filter layer 3a attached to the back surface of the transparent conductive member 11 with the true melt adhesive 2, and FIG. 1(F) shows the filter layer side attached to the transparent conductive member 1
1 (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 true melt adhesive 2 is applied to the photosensitive layer 12 side when adhering the photosensitive layer 12 onto the photosensitive layer 12 (for example, when manufacturing the photoreceptor shown in FIG. 1(C)). has been done.

That is, as shown in FIG. 5(A), a photosensitive layer 12 is first formed on a conductive member 11, and then a true melt adhesive layer 2 is uniformly coated on a release film 16 using a roll coater. It is superimposed on the photosensitive Jii 12 as shown by the arrow 17. 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 layer 2 is transferred onto the photosensitive layer 12.

After that, the filter layer 3a is stacked as described above,
It adheres 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. It 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, photosensitive 111
A photoreceptor can be produced by stacking the photoreceptor on top of the photoreceptor 2 and pressing it, and then punching it according to its 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 can be bonded as is, so thermal damage to the photosensitive layer 12 is reduced.

FIG. 6 shows a composite filter having the structure shown in FIG. 1(C) which is laminated onto the photoreceptor surface of the photoreceptor coated with adhesive 2 while peeling 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 part for the laminated web, 32 is a winding part for winding up the support after the thin film row M, 33 is an unwinding part for the film-like photoreceptor, and 34 is a winding part for the completed photoreceptor. This is the take part. 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 application roller 37. The amount of adhesive applied is regulated by a doctor 38. The laminated wedge has its filter layer surface pressed against the adhesive-coated photoreceptor surface by a laminating roller 39, and the thin film having the filter layer is peeled off from the laminated wedge and adhered to the photoreceptor surface.
The completed film-like photoreceptor is wound up by the winding section 34. The support with the adhesive layer from which the thin film has been peeled off is wound up in 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 adhesive 2 is applied to the photosensitive drum 40 by the application roller 37 . It is heated by an external heating device to melt the adhesive and give it adhesive properties. The laminated web may be heated by an external heating device, or both the photoreceptor drum and the laminated web may be heated, or a heating mechanism may be provided in the laminated web unwinding part 31 and the support part of the photoreceptor drum 40. ,
- or both may be heated, to which the thin film with the cut filter layer moves 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 members at an angle with respect to the direction of movement of the photoreceptor reduces the pressing force against the cleaning blade, improving cleaning performance, and also makes it easier to separate the photoreceptor from the bonded part and to remove the color separation member. Peeling can also be prevented.

Next, a process for forming a multicolor image using the photoreceptor according to the present invention will be described. First, the entire surface is subjected to primary charging, secondary charging, and simultaneous image exposure to form a primary latent image corresponding to the color separation image density on the photosensitive layer below each filter.
Next, by exposing the entire surface to specific light, only the photosensitive layer below the filter through which this specific light has passed is formed with a secondary latent image having a surface potential strength or weakness corresponding to the intensity of the bubble image, that is, a potential pattern. form. 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 in FIG. 1, and 3 includes the above-mentioned high-resistance three-color (B, G, R) composite filter 3a and thin film 3b (further protective layer in some cases). However, in order to simplify the drawing, only the filter layer is shown and other layers are omitted. The hot melt 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 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 exposure slots and gates, and while erasing the charge on the surface of the composite filter 3, image exposure Lr from the multicolor original is applied. 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 (arrow Lr)
Indicates the condition of the part that has been applied. The red light Lr passes through the red color separation filter section 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 light is absorbed into the photosensitive layer 12. The induced negative charge 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 Lr, some of the positive charges on the layer 3 are erased, but the negative charges in the photosensitive layer 12 remain as they are. , and a charge corresponding to the partially erased positive 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, charger 5
As a scorotron charger, 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 produces a potential pattern in only 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 F8.

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

As shown in FIG. 8 [4], by developing this with a developing device 7 carrying negative yellow toner T, 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 (arrow LG) obtained by the light source 9 and the green filter F, the negative charges in the photosensitive layer 12 are removed from the conductive member. 11 are neutralized, and a high surface potential shown in the lower graph is obtained in the 3G region of layer 3.

As shown in FIG. 8 [7], a magenta toner image is obtained in the 3G region by developing this with a developing device IO carrying magenta toner T4.

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. Thus, when the yellow toner image and the magenta toner image are transferred and fixed onto the transfer material, a red image in which yellow and magenta are superimposed is visually observed on the transfer material.

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

The symbol r:H>J represents the formation of a primary latent image, the symbol "O" represents the formation of a secondary latent image, and the symbol "O" represents the process at each stage of toner image formation. Further, the code "1" 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 layer 3), 4 is a positive DC-forming charger, 5 is a negative DC corona discharge scorotron charger having a slit for image exposure, and 6 is a blue filter F.
7 is a light source that emits blue light, and 7 is a developing device containing yellow toner. 8 is a scorotron charger for negative DC corona discharge; 9 is a light source having a green filter Fc and emits green light; 10 is a developing device containing magenta toner; 14 is a scorotron charger for negative DC corona discharge , 18 is a light source that has red filters F and I and irradiates red light LR, and 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 charge that removes static electricity while exposing the electrode to white light or infrared 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 by the charger 5, and at the same time, the image exposure 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 by a white or blue light source 6 equipped with a blue filter F8, and step 8 is performed.
An electrostatic charge image corresponding to the bubble image is formed in the area of the blue separation filter, and this is developed into yellow by a yellow developing device 7.

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 to light by a white or green light source 9 equipped with a green filter F6, and a magenta developer is applied. Develop magenta at 10.

Next, after erasing the remaining electrostatic image using a negative scorotron charger 14, the entire surface is exposed to light using a white or red light source 18 equipped with red filters F and I, and cyan development is performed 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, either of the p-type and p-type photoreceptors may be used.

As is clear from the above description, the photoreceptor according to the present invention is a photoreceptor in which an insulating composite filter is provided on the photoreceptor layer. 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 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 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 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. 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. In this method, a one-component developer consisting only of non-magnetic toner whose coloring can be freely selected, and a two-component developer containing non-magnetic toner are used. It is preferable to use a developer, form an alternating electric field in the development area, and perform development without bringing the electrostatic image support and the developer layer into contact.However, a developer using magnetic toner may also 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 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 B, G, 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.

Suzai LLL Ketchen blank (conductive carbon) and vinyl chloride
A 2.3 μm thick electrosensitive 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. Using the apparatus shown in FIG. 6, a photoreceptor with a thickness of 2 μm having the structure shown in (C) and FIG. A color separation filter was placed on a polyester film having a thickness of 15 μm, and the same was bonded to produce an image carrier.

Compound 1: Compound 2: η In this example, an adhesive having the following components was used to bond the thin film having the above filter layer to the photoreceptor.

EVA (ethylene-vinyl acetate rubber) 40
Part by weight SBR (butadiene-styrene rubber) 30 Hydrogenated rosin ester 8 Plasticizer
2 First, this image carrier is
It was incorporated into the image forming apparatus shown in FIG. 2, and images were formed. In FIG. 12, a primary charger 4 is attached to an image carrier 40.
The image carrier 40 was charged to have a surface potential of -2200V.

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

Next, while performing image exposure, the image carrier 40 was charged to a surface potential of +50 V using a secondary charger 50H- consisting of a scorotron corona discharger having an alternating current component.
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 background part of the original paper is +50v, and the black background part of the original paper is -30v.
An electrostatic image with a contrast of approximately 350 V to 0 V was formed. This potential contrast was about 1/3 of that when a transparent insulating layer was used. This electrostatic image was developed using a developing device 7.

In the developing device 7, 70-t% magnetite was dispersed in the resin, the average particle size was 25μ-1, and the magnetization was 30es+u/
g, a carrier with a resistivity of 1014 Ω-〇■ or more; non-magnetic toner T for positive charging with an average particle size of 10 μm, which is made by adding 10 parts by weight of a benzidine derivative as a yellow pigment and other charge control agents to a styrene-acrylic resin; The ratio of toner to the developer is 20wt%.
It was used under the following conditions. Further, the outer diameter of the developing sleeve 47 of the developing device 7 shown in FIG. 13 is 30111111,
The rotation speed in the direction of arrow B is 1100 rpm, and the magnetic flux density of the N and S poles of the magnet 43 rotating in the direction of arrow A is 90 rpm.
0 gauss, rotation speed is looorpm, developer layer thickness in developing area is 0.3 mm, 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 2.0kHz, 1000V AC voltage (the amplitude of the construction wave is
A non-contact development condition was applied in which a voltage of V) was applied.

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 connects the developing sleeve with a power supply of 45
．． This is achieved by separating the developing sleeve from the 46 and leaving 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. , it is preferable to apply a DC bias voltage. or,
When not developing, the driving of the developing device was stopped. Developing device 10.
19 is also assumed to be developed under the same non-contact developing conditions as developing device 7, so the developer layer on the developing sleeve should not be removed (
You can. This developing device 10 uses a developer having a composition in which the toner in the developing device 7 is changed to a toner containing polytungstophosphoric acid as a magenta pigment instead of a yellow pigment, and the developing device 19 uses the same ( A developer with a composition in which the toner was changed to a toner containing a copper phthalocyanine derivative as a cyan pigment was used.Of course, it is also possible to use a color toner containing other pigments or dyes, and the order of the colors to be developed can also be changed. The order of the colors to be developed can be determined appropriately so that a clear color image can be obtained.
It may be related to the clarity of the color image and the potential contrast that can be obtained, so it must be determined carefully.

After the surface of the image carrier 40 developed by the developing device 7 was recharged to a surface potential of +90 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 +75
Compared to V, the black area was -260 cm. This electrostatic image is transferred to the developing sleeve with a DC component of -10V and an AC component of 2.0V.
Developing was carried out in the developing device 10 under the same conditions as in the developing device 7 except that a voltage of 100 OV at kHz was applied.

Similarly, the scorotron charger increases the surface potential to +110
After being recharged to V, uniform exposure was performed through a red filter. As a result, an electrostatic image of +90v for the white background and -210v for the black background is formed, and this electrostatic image is transferred to the developing sleeve with a DC component of +30V and an AC component of 2.0 kH.
Development was carried out in the developing device 19 under the same conditions as in the developing device 7 except that a voltage of 100 OV was applied.

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

(The following margins are continued on the next page.) Table 1 As an image carrier 40, a 60 μta thick AStSe photosensitive layer exhibiting spectral characteristics as shown in FIG. A 2 μm thick color separation filter having the structure shown in Figure (B) and the spectral characteristics shown in Figure 11 was bonded to a 15 μm thick polyester film. . The adhesive used was Example 1.
It was the same. 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 II 1 m, and the rotation linear speed was 200 mm/sec. In this example, a thin film and a sheet-like photoreceptor were attached, and sufficient adhesive strength was obtained.

(The following margins are continued on the next page.) Table 2 Next-U Example 1.2 is an example in which a thin film having a filter layer is attached to a sheet-like photoreceptor. A laminated web is created by printing a composite filter layer in the same manner as above on a web that has been subjected to mold release treatment on the side and stopped the mold release treatment on the support side so that the adhesive remains on the support side during peeling. did.

Using the apparatus shown in FIG. 7, the thin film having the filter layer was peeled from the laminated web, cut into a suitable size, and then sent to a photoreceptor drum. An adhesive was applied to the photoreceptor drum by dipping in advance. In this example, the adhesive was heated by an external heating device to melt the adhesive and make it sticky.

There, the thin film with the cut filter layer is moved,
It was attached 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). 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) because of the advantages that it is resistant to wear and scratches during use and 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 coat the photosensitive layer in advance.

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.

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

As a result, the images produced by the photoreceptor produced using the adhesive according to the example were good, whereas when produced using a water-soluble adhesive, image fading occurred depending on the type of adhesive. There were various results, including those with poor image contrast, those with no image contrast, and those with stuck images (toner did not adhere and no image was formed). No better image could be obtained with the photoreceptor using the example adhesive.

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 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], [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. 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 reference numerals shown in the drawings, 1--------------- One supporter 2
．． 13・-1---------Adhesive layer 3 a
−−−−−・−−−−・−−1−−−−・・Filter layer 3 b−・・−・・−・−・−・−・・Thin film 3c・−・
−・−・−−11−−Protective layer 11−−−−−−−−−
-----------Conductive member 12----------
-m-・-・-・・-・-Photosensitive layer. Agent Patent Attorney Hiroshi Aisaka No. 1 Heel-57 Figure 4

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 hot melt adhesive.