JPS6188269A - Electrophotographic sensitive body, its manufacture and formation of image - Google Patents

Abstract

PURPOSE:To register easily color toner images and to obtain stably a polychromatic image having high quality for a long period by forming a composite filter layer consisting of plural kinds of filters each having a heat transferred image and contg. a colorant and a transparent binder. CONSTITUTION:An electrophotographic sensitive body 1 having a composite filter layer 4 consisting of plural kinds of filters each having a heat transferred image and contg. a colorant and a transparent binder is imagewise exposed, and it is uniformly exposed to specified light to form a potential pattern on filter parts corresponding to the light. The potential pattern is developed with an image forming toner. Said uniform exposure and development stages are repeated to form color toner images corresponding to the colors of the filters on the sensitive body 1. In order to prevent color migration among the color separation filters, color separation filters, such as 4a1, 4a2, are formed by layers on an intermediate layer 4b formed on the photosensitive layer 3, each of the filter layers is covered with a thin resin coat, and a protective layer 4c is preferably fdormed as the top layer. When the sensitive body is used, a polychromatic image having high quality can be obtd. by only a single imagewise exposure without registering the color toner images.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrophotographic photoreceptor for forming a multicolor image by electrophotography, a method for manufacturing the same, and an image forming method.
It can be used in various multicolor image forming devices, Fuller printers, etc.

[Conventional technology]

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

For example, there is a multicolor image forming method and system R (the former) in which a toner image of each color is formed on an electrophotographic photoreceptor by image exposure and development according to each color separation and is transferred to recording paper each time.

Alternatively, for example, using a device equipped with a plurality of photoreceptors corresponding to the number of separated colors, each of the photoreceptors is subjected to image exposure and development of each color to form a toner image of each color, and this is sequentially printed on recording paper. There is a method and apparatus (the latter) for transferring.

[Problem that the invention seeks to solve]

However, in the former method, the photoreceptor is rotated several times to form a toner image of each color, so it takes a long time to record an image, and it is difficult to increase the speed. The latter method is advantageous in terms of high speed because it uses multiple photoreceptors in parallel, but it also has drawbacks such as the use of multiple photoreceptors which makes the device larger and more expensive. . Furthermore, since the former and latter transfers are repeated several times, there is a problem in that it is difficult to align the images.

[Means and effects for solving the invention] The present invention was discovered by focusing on the above-mentioned problems, and provides a group of multiple types of filters including a thermal transfer image containing a coloring agent and a transparent binder. The present invention provides a 14-layer photographic photoreceptor having a layer containing a composite filter having a resistivity of preferably 10" Ωa1 to υ preferably IQ+8 Ωα or more. Furthermore, the present invention provides It has a step of forming a linear or mosaic thermal transfer image using a plurality of types of heat-sensitive sheets, including a heat-sensitive sheet of which The present invention provides an electrophotographic photosensitive manufacturing method for forming a composite filter consisting of a plurality of types of filter groups.

Furthermore, the present invention provides 1. preferably has a specific resistance of 10'Ωα or more, preferably 1
A process of imagewise exposing a photoreceptor having a layer containing a composite filter of 0I3Ωα or more, and a process of uniformly exposing a photoreceptor with a specific 4fQ to form a potential pattern on each corresponding filter portion, and developing this with toner. An image forming method is provided, which includes the step of repeating the steps.

In the present invention, on a photosensitive layer that is sensitive to at least the entire visible light range, a composite material is provided with necessary physical properties by a binder made of resin or wax, an intermediate layer or a protective layer made of an insulating film, etc. A photoreceptor with a filter is used. In order to form, for example, a multicolor image using the photoreceptor, for example, the entire surface of the photoreceptor is subjected to primary charging, secondary charging, and simultaneous image exposure.
A primary bamboo image corresponding to the decomposed image density is formed in the '6-element layer. Then, by subjecting the entire surface to a specific light, in this case the same color as the color of the first color segment filter, only the photosensitive layer at the bottom of the cough-colored filter corresponds to the intensity of the primary latent image. Surface potential strength (2 with tL potential pattern)
A latent image is then formed. This secondary latent image is developed with toner having a complementary color to that of the filter. Thereafter, a multicolor image is formed on the photoreceptor by recharging to smooth the surface potential and a potential pattern at the next separation filter section. These multicolored 11 sheets are transferred and fixed onto the recording paper in one overlapping manner by only one transfer.

Hereinafter, the photoreceptor used in the invention, its manufacturing method, and image forming process will be explained with reference to FIGS. 1 to 3.

FIG. 1 schematically shows a cross section of a photosensitive material according to the present invention. A photosensitive layer 3 is provided on the conductive member 2, and a required color separation filter, for example, fine red (R), green (
A layer 4 containing a composite filter consisting of a group of color separation filters of R) and blue (B) is arranged in a weighted manner. The conductive member 2 is
aluminum, iron.

It may be made of metals such as nickel, @, or alloys thereof, and may have an appropriate shape or structure as required, such as a cylindrical shape or an endless belt shape.

The photosensitive layer 3 includes a photoconductor made of sulfur, selenium, amorphous silicon, or an alloy of these with tellurium, arsenic, antimony, etc.; It is formed by vapor depositing or dispersing an inorganic photoconductor such as a compound, iodide, sulfide, or selenide in a binder resin. Also,
Vinylcarbasol, anthracene-7talocyanine, trinitrofluorenone, polyvinylcarbasol, polyvinylanthracene, polyvinylpyrene.

It is formed by applying an organic photoconductor such as a polycyclic quinone dye or a bisazo dye together with a binder resin if necessary. Such a binder resin is polyethylene.

polyester, polypropylene, polystyrene.

Resins such as polyvinyl chloride, polyvinyl acetate, polycarbonate, acrylic resin, silicone resin, fluororesin, and ebogishi resin are used. It is also possible to use a functionally separated light guide 1'J, which is divided into a charge generation layer and a charge transfer layer.

The composite filter contained in the layer 4 may contain only a coloring agent including a binder, but preferably 50% by weight or more of a binder and 2% or more of a colorant by weight less than 50% by weight, as necessary. It is formed by containing a plasticizer and an ultraviolet absorber.

N4 including such a composite filter is one in which only a composite filter 4a containing 50% or more of a binder is formed on the photosensitive layer 3 sealed as necessary as shown in FIG.
As shown in FIG. B, an intermediate layer 4b of the photosensitive layer 3 is provided, and a composite filter 4a is formed thereon. Furthermore, the first
The photosensitive layer 3 in Figure C is laminated with an intermediate layer 4b, a covering filter 4a, and a protective layer 4C, and the photosensitive layer 3 in Figure 1 is laminated with a composite filter 3a and a protective fiN 4c after sealing if necessary. It may be something. In any case, M4 including the composite filter has a specific resistance of 10110 as a whole.
Two or more types of insulation are required. However, in some cases, the binder content is less than 50% by weight, or in the case of an A-group filter in which only the colorant is thermally transferred, as shown in Figure 1E, to prevent color bleeding between the photosensitive layer 3 or the separation filter. First, an intermediate layer 4b is provided on the photosensitive layer, and each color separation filter group is placed on top of the intermediate layer 4b.
, 4a and 4a, and each layer is coated with a thin resin. Preferably, a protective layer 4c is further laminated on the top layer. Alternatively, as shown in FIG. 1F, after providing an intermediate layer 4b on the photosensitive layer 3, a composite filter 4a having partitions 5 between each color separation filter group is formed. Examples of the binder for the composite filter 4a include polyolefin, ethylene-vinyl acetate copolymer, styrene-butadiene copolymer, urethane rubber, and other hot-applied plastic resins or oligomers having a molecular weight of 10,000 or less. There are waxes such as waxy higher alcohols, higher fatty acids, higher fatty acid esters or amides, polycaprolactone, and polytetrafluoroethylene. Such waxes are
For example, it is known under trade names such as carbowax, carnauba wax, and ester wax.

The coloring agents include copper phthalocyanine, blue dyes and pigments such as methylene blue, Victoria blue, Neozapone blue, and oil blue, green dyes and pigments such as brilliant green, malachite green, and 7-tall green, fuchsin, phenosash, and rhodamine. B. Red dyes and pigments such as naphthol red and ozabone red. The heat-sensitive sheet used in the present invention includes, for example, a sheet in which the above-mentioned adhesive and colorant are dissolved in an organic solvent.
()densor paper, polyester film.

A viscous liquid is applied by applying it to an aluminum gelatin, or by applying a viscous liquid made by mixing an organic solvent with 5 to 30% lubricating oil for 9 hours and drying it. You can also use the sheet.

In order to form the composite filter 3a using such a heat-sensitive sheet, for example, the method shown in FIGS. FIG. 3 formed in FIGS. 2B and 2C is a cross-sectional view showing the heat-sensitive layer 8 of the heat-sensitive sheet 6 in a photosensitive state.

The fourth column shows a cross-sectional view of an apparatus for forming a thermal transfer image on the sheet-like photoreceptor 1 using a general thermal recording apparatus. That is, the heat-sensitive sheet 6 passed between the original roll 11 and the take-up 12 is pressed together with the photosensitive paper (or insulating film) 1 against the heat-sensitive head 10 by the press roll 13. A signal voltage for forming a linear or V-shaped mosaic composite filter is applied to the thermal head 10, and a thermal transfer image is formed on photosensitive paper (or insulating film) in accordance with the signal voltage. According to this heat-sensitive recording device, the tension of each of the photosensitive paper and the heat-sensitive sheet can be freely adjusted independently, so it is not only possible to easily form a double 8 filter without wrinkles or distortion, but also with a commercially available recording device. It has the advantage of being reusable.

FIG. 5 shows a main roll 11 of a heat-sensitive sheet on the outer periphery of a drum-shaped photoreceptor l. The winding 12 and the thermal head 10 are colored blue, for example.
Three color heat-sensitive sheets are arranged for each of green and red heat-sensitive sheets, and as the photoreceptor 1 rotates, three color filters are applied to the photoreceptor 1.
Figure 3 shows a cross-sectional view of the device as formed above.

FIGS. 6 and 7 are perspective views of an apparatus for forming a thermal transfer image using a heat-sensitive sheet 6 in which heat-sensitive adhesives of each color are sequentially arranged on a sheet-like photoreceptor (or insulating film) or a drum-like photoreceptor l. There is. That is, from the original volume 11, blue (B), green (G
), red (R), and a thermosensitive sheet 6 having colored thermosensitive layers in this order
The hook is passed to the winder 12, and is fed in synchronization with the feeding of the photoreceptor l.

These are held between the thermal head 10 and the pressure roll 13 or the drum-shaped photoreceptor 1, and a thermal transfer image of the composite filter is formed by a heating action based on a signal.

Since the composite filter made of the thermally transferred image of the present invention uses a binder with weak physical properties, it is disadvantageous in terms of abrasion resistance. Therefore, depending on the photosensitive usage conditions 1/C, a protective layer is absolutely necessary.

Incidentally, the thermal transfer image for forming the composite filter of the present invention is required to have one pair of film rings after thermal transfer and to be uniform. So, for example, heat.

Although it is necessary to shape the shape using a solvent, pressure, etc., the binder used is a wax or low molecular weight resin that has a thermoplastic resin, and is excellent in hole workability.

The repetition width of the color separation filters constituting the various types of composite filters shown in FIG. 2 A, B, and C (see FIG. 2 1)
) is preferably 30 to 500 μm; if the repetition width l is too small, not only will it be easily influenced by other adjacent color separation filters, but it will also be difficult to create the filter. Furthermore, if the repeating width l is too large, the resolution and color mixing properties of the image will decrease, resulting in poor image quality.

Next, the process of forming a multicolor image using the photoreceptor of the present invention will be explained. FIGS. 8(1) to 8(8) schematically show the image forming process in a photosensitive layer 3 using an n-type semiconductor such as cadmium sulfide.

In the figure, numerals 2 and 3 are conductive members, respectively, as in Fig. 1.

At the end of the photosensitive layer, 4B, 4G, and 4R are heavy color, green, and red separation filters of the composite filter 4a. Also, the 8th
The graphs at the bottom of Figures (1) to [8] show the potentials on the surface of each part of the photoreceptor.

First, when a positive corona discharge is applied to the entire surface by the charger 14, a positive charge is generated on the surface of the covering filter 48, and correspondingly, a negative charge is induced on the interface between the photosensitive Jd 3 and the R114 including the filter. The situation will be as shown in Figure 8 [1].

Next, a positive or negative discharge is applied by an fc charger 15 equipped with a U-source slit, and while erasing the charge on the surface of the layer 4 including the composite filter, the image X! Light is applied. This exposure takes into consideration the spectral characteristics of the layer 4 including the light source and the composite filter, and the spectral sensitivity of the photosensitive material, and a filter is disposed midway to adjust the color balance. In the following description, photoreceptors generally include, for example, blue, green,
Although image exposure is performed from a multicolor source such as red, for the sake of clarity, the image forming process will be explained using an original having only a red image as an example.

FIG. 8 [2] shows the state of the portion subjected to image exposure (arrow Lr) from the red image. The red light Lr passes through the red color separation filter section 4R' of the layer 4, and the photosensitive layer 3 located below it.
Since the layer is conductive, most of the positive charges on the layer 4 are erased, and the negative charges induced in the photosensitive layer 3 are also erased, so that the surface potential becomes close to zero potential.

On the other hand, the green and blue separation filter section 4G.

Since 4B does not transmit the red light Lr, some of the positive charges on the layer 4 are erased, but the negative charges in the photosensitive layer 3 remain as they are, and correspond to the partially erased positive charges. The electric charge is conductive! Induced by Note Part 2. In such a charge arrangement, the surface potential on the green and blue separation filter sections 4G and 4B is close to zero potential. Therefore, although the composite filter 4a has a charge pattern in the form of primary mgN, it is not possible to form a toner image because there is no surface potential difference. However, by controlling the grid potential by using the charger 5 as a scorotron charger, for example, -20
The surface potential may be uniform, such as 0 V.Next, specific light, such as the light source 16 and the blue filter F, can be used to generate a potential pattern in only one type of the color separation filter of the layer 4.
The entire surface is exposed using the blue color source (arrow, ) obtained by . In this case, part of the negative charge of the photosensitive layer 3 at the bottom of the decomposition filter 4B that transmits the blue color and the conductive member 2
The positive charges are neutralized, and positive and negative charges remain between the layer 4 corresponding to the part of the decomposition filter 4B and the photosensitive layer 3, as shown in FIG. A positive surface potential is applied. By developing this with the developing device 17 carrying negative yellow toner Ty1c as shown in FIG. 8 [4], a yellow toner image is formed on the color separation filter 4B. In the area of the separation filter 4B where this yellow toner image was formed, the surface potential remains unsaturated due to 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, the surface of the layer 4 is recharged with alternating current or negative direct current, preferably with a negative corona discharge using a scorotron device 8, to obtain a flat surface potential as shown in the lower graph of Figure 8 [5]. will be returned to. In this case, it is desirable to use the same surface potential as in FIG. 8 [2].

Next, by exposing the entire surface to green light (arrow L11) obtained by the light source 16 and the green light source filter F0, as shown in FIG. 8 [6], the negative charges in the photosensitive layer 3 and the conductive The positive charges of the sexual member 2 are neutralized, and a high surface potential as shown in the lower graph is obtained in the 4G region of the layer 4. By developing this with a developing device 19 carrying magenta toner T shown in FIG. 8 [7], a magenta toner image is obtained in the 4G area. Next, after recharging (Fig.
]), the entire surface is subjected to 5'E processing using red light obtained by the red filter F1, but at this time, no potential pattern is generated and no development is performed with the cyan toner Tc. When the yellow toner image and magenta toner image are transferred and fixed onto the recording paper in this manner, a red image in which yellow and magenta are visually superimposed is visually observed on the recording paper.

The above explanation is based on the case where the original is a red image, but it also applies when the original is a white, green, blue, yellow, magenta, cyan, or black image, or an image with a mixture of these colors. Similarly, nine colors are reproduced by a combination of the three-color separation method and the additive color mixture of three 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 sign "knee%,," is -
Next latent image formation, code 0JVi represents that the secondary latent image formation, code is maintained, and blank spaces represent areas where latent image formation is not performed.

Similarly, in the above explanation, an n-type conductor is used as the photoreceptor, but a photoreceptor using a Pm semiconductor such as selenium may also be used. Actually, there is no father. Of course, for photoreceptors that can be used as either n-type or p-type, either type may be used.

As is clear from the above description, since the photoreceptor of the present invention has a composite filter 4A which is protected by an insulating film or the like on the photoreceptor layer, it is susceptible to abrasion damage during storage or during image formation. Or, excellent filter performance can be maintained for a long time without deterioration. In addition, there is no blocking effect on the photoconductivity of the photosensitive layer and there is no bleeding between the color separation tile filters.
High resolution multicolor image formation on the photoreceptor can be achieved. In addition, the uninvented composite filter is 50! It is desirable that the binder be contained in a binder with a binder content of at least 100%. In this case, not only will the above effects be further promoted, but also the adhesion to the photosensitive layer or the film for the protective layer will be strong, which will prevent peeling, wrinkles, etc. Filter distortions are eliminated.

Further, since the photoreceptor having the composite filter can be manufactured using a conventionally known technique of thermally transferring a colored heat-sensitive layer, it can be advantageously manufactured in terms of equipment.

Further, in the image forming method, a photoreceptor having the above-mentioned composite filter with excellent performance is used, and when a secondary latent image is formed by repeating full-surface exposure, when the previous secondary latent image is developed, Since a detailed method is used in which the next secondary latent image is formed after the visible residual latent image is sufficiently erased, a stable, high-quality multicolor image can be obtained.

Further, in the image forming method of the present invention, a multicolor image with excellent color balance and no color shift can be obtained quickly and easily by only one image exposure.

The layer containing the composite filter of the present invention usually has a thickness of 5 to 100 μm, preferably 10 to 50 μm, and the amount of colorant deposited on the photosensitive layer or film is determined by the unit area (f). Preferably, it is 5 to 500 μ5.

The binder resin used in the photosensitive layer on which the composite filter is provided is the original binder resin to avoid the influence of penetration of the heat-sensitive ink from the heat-sensitive sheet and the influence of the adhesive when bonding the protective layer or intermediate layer, etc. Alternatively, it is desirable to use a thermosetting resin. Examples of such binder resins include thermosetting acrylic resins, silicone resins, polyamide resins, melamine resins, incyanate resins, phenol-formalin resins, and cinnamic acid resins. It will be done.

Next, as a method of forming a multicolor image by using the photoreceptor having the composite filter, the so-called NP method is used, which utilizes charges induced in the photosensitive layer as described above. When forming a secondary latent image by
In order to eliminate the trouble caused by the residual latent image, recharging is performed when necessary, and this recharging is performed by alternating current or negative direct current discharge, preferably by negative direct current discharge using a scorotron charger.

〔Example〕

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

(Example 1) FIG. 10 shows blue and green for explaining this embodiment.

02o is a drum-shaped photoreceptor, 21
22 is a positive direct current primary Teiden device, 22 is a negative direct current corona emission scorotron charger having a slit for image exposure, and 23 is a negative direct current corona emission scorotron charger.
B is a light source that has a blue filter F and irradiates blue '''/l, L, 24Y is a developer containing yellow toner, 25 is a scorotron charger for negative direct current corona radiation, and 26G is a scorotron charger for negative direct current corona radiation. 27M is a developer containing magenta toner, 28 is a negative DC scorotron charger, 29R is a red light source that has a red filter Fl and emits red light, and 27M is a main unit that emits all light. ,30C
is a developing device containing cyan toner. P is recording paper,
Reference numeral 31 designates a transfer electrode, 32 a separation electrode, 33 a static eliminator for removing residual charges that removes static electricity while emitting white light from the back surface of the electrode, and 34 a υ-ning blade.

The photoreceptor 20 has a cadmium sulfide/resin fraction layer of 30 μm thick on an aluminum base drum, the photosensitive layer is sealed with thermosetting acrylic resin to a thickness of 0.5 μm, and three layers of blue, green, and red are applied on top of the photosensitive layer. A color mosaic type composite filter (FIG. 2B) was formed, and a protective layer of a Mylar film having a thickness of 20 μm was formed thereon. The front ΔPia filter was created using three types of thermal transfer sheets of blue, green, and red colors, each of which was coated with an ink composition having the following formulation on a 10 μm thick polyester film to a thickness of 12 μm after drying.

Formula carnauba wax 20 parts by weight Ester wax 40 parts by weight Colorant 20 parts by weight Lubricating oil 0 parts by weight Butyl acetate 10 parts by weight Ultraviolet absorber 0.1 parts by weight Heat-sensitive sheeters of the above three types As shown in Figure 5 After placing a sealing layer of thermosetting acrylic resin on the photoreceptor 20 in advance, the mosaic blue (B) filter signal and green (G) filter signal shown in FIG. ,
A heating voltage based on the red 8 (R) filter signal was applied to the thermal head to form a thermally transferred image on the a light body 20, thereby forming a composite filter. This composite filter is adhesively coated with a protective layer consisting of a 15 μmg Mylar film, and the photosensitive layer of the photoreceptor 20 is made of 100% cadmium sulfide! 40 parts by weight of a thermosetting silicone-modified acrylic resin and 100 parts by weight of triene were spray-coated.

The photoreceptor 20 having the above configuration is first given a uniform positive i'dL by the charger 21, and then the AC charger 22 is applied with a uniform positive i'dL.
At the same time, the image exposure from the three primary colors of blue, green, and red was subjected to scanning exposure, and a primary latent image corresponding to the intensity of image exposure was formed for each color separation filter of the composite filter. Next, the entire surface is exposed by a white light source 23B equipped with a blue filter F1.

is applied, and an i# charge image corresponding to the -order latent image is formed in the region of the blue separation filter, which is transferred to the yellow developing device 2.
I got a yellow developer in 4Y.

Next, the trailing edge color filter F, in which the static charge gR remaining in the area of the blue separation filter is erased by the negative scorotron charger 25, is exposed to light on the entire surface by the white light source 26G, which is magenta 27M. Developed.

Next, after erasing the remaining electrostatic charge image by the negative scorotron charger 28, the entire surface is exposed to light by the white light source 29R equipped with the red filter F1, and the cyan developer 30
C was developed in cyan. In this way, a multicolor toner image corresponding to the original is formed on the photoconductor 20, and is transferred to the recording iP where the paper was fed at the same timing by the action of the transfer electrode 310, and separated by the action of the separation electrode 32. After that, it was fixed by a fixing device (not shown). On the other hand, the photoreceptor 2 after transfer
0 was neutralized by a static eliminator 33, residual toner was removed by a cleaning blade ALL, and the image was prepared for primary image formation.

The development in the present invention is preferably carried out by a magnetic brush method, and the developer used may be either a so-called l-component developer using magnetic toner or a so-called two-component developer using a mixture of toner and a magnetic carrier such as iron powder. be able to.

For development, a method of directly rubbing with a magnetic brush may be used, but in order to avoid damage to the fully 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, such as U.S. Pat. Specification No. 893.418, Special Publication No. 55-18656, Japanese Patent Application No. 58-57446
No., Japanese Patent Application No. 58-238295, Japanese Patent Application No. 58-238
It is particularly preferable to use the methods described in the specifications of 29 Samurai. In this method, a one-component developer consisting only of non-magnetic toner or a two-component developer containing non-magnetic toner, whose coloring can be freely selected, is used to form a certain number of fields in the development area, and the electrostatic image support is Developing is performed without bringing the developer N into contact with the developer N. Further, in this developing method, a developer containing magnetic toner may be used. In order to perform development without contact in this manner, the gap between the photoreceptor and the developing sleeve is set to be larger than the thickness of the developer layer on the developing sleeve (provided there is no potential difference between them).

The color toner used for development is made of known resins commonly used in toners, organic and inorganic pigments, dyes, and other chromatic and achromatic colorants, and various magnetic materials. It is possible to use a toner for developing electrostatic images made by this technology, and the carrier may be iron powder, ferrite powder, which are usually used for electrostatic images, resin coatings thereof, or magnetic materials dispersed in resin. Various known carriers, such as magnetic carriers such as

In addition, the applicant previously filed % Application No. 58-2496.
The developing methods described in the specifications of No. 69 and No. 240066 may be used.

(Example 2) Using the thermal ink having the formulation of Example 1, as shown in FIG. 7, blue (B) ink, Green (G) ink and red (CR) ink were sequentially applied and dried to a thickness of 6 μm to create a thermal transfer sheet. As shown in Figure 7, this heat-sensitive sheet is passed from the original roll to the take-up, and is fed in the direction of the arrow in synchronization with the rotation of the photosensitive sheet in the direction of the arrow. (Figure 2B)
A mosaic composite filter is formed on the photoreceptor 10 by heating based on the signal voltage.A 20 μm film made of polyethylene terephthalate film is placed on the filter.
Cover with m-thick shrink tube and heat at 110°C.
The tube was left to stand for 5 minutes, and the tube was shrunk to form a protective layer.

When a three-color image was formed in the same manner as in Example 1 using the photoreceptor 20 provided with the composite filter and protective layer in this manner, a high-quality recorded image was obtained without any color shift.

All of the above explanations have been about actual examples of image forming apparatuses that use so-called three-color separation filters and three primary color toners.
The embodiments of the present invention are not limited to these, and can be widely used in various multicolor image recording devices, color photo printers, and the like.

It goes without saying that the combination of the color of the separation filter and the color of the toner corresponding thereto can be arbitrarily selected depending on the purpose.

In addition, the term "electrification" as used in the present invention includes an increase in which the surface potential obtained when performing an electric shock becomes 0 or the charge on the surface disappears. The spectral characteristics of the light for exposure are blue (B) and green (G).
), Red (R) Phil! However, it may be obtained by means other than filters, and its spectral characteristics are not limited to G, B, and H. In short, by exposing the entire surface to specific light, What is necessary is to find a spectral characteristic that forms a potential pattern only in a specific filter portion corresponding to specific light. Therefore, in the present invention, "multiple types of filters" refers to a single type of color separation filter (a filter that transmits only a % constant wavelength range) and a part without a filter (
The photoreceptor may have a layer consisting of a transparent resin, air, etc.). The portion without this filter is regarded as a transparent filter, and is included in the above-mentioned "multiple types of filters." In this case, the transparent filter is preferably manufactured from a heat-sensitive sheet that does not contain a colorant.

〔Effect of the invention〕

As is clear from the above description, the photoreceptor of the present invention has a composite filter with excellent physical properties such as abrasion resistance, moisture resistance, adhesiveness, and electrical properties! r! & Because it is an original light body, there are no problems such as deterioration of the filter, deformation, color bleeding, etc., and it has stable characteristics that can withstand long-term use.

Therefore, when used for image formation, a stable and high quality image 9 can always be provided. In addition, the conventional multiple image exposures can be replaced with a single image exposure, and the difficulty of aligning each color toner image during transfer is eliminated, making the device more compact, faster, and more reliable. improvement is measured.

[Brief explanation of drawings]

Figures 1 through F are cross-sectional views of the photoreceptor according to the present invention, Figures 2 through C are arrangement diagrams of the color separation filters constituting the composite filter, and Figure 3 shows the thermally transferred image from the heat-sensitive sheet onto the photoreceptor. 4 and 5 are sectional views of various thermal transfer devices, and FIGS. 6 and 7 are fP+ views of the thermal transfer device. Figure 8 [l] to Figure 8 [8]
9 is a cross-sectional view for explaining the image forming process, FIG. 9 is a chart for explaining the image forming process from each color original, and FIG. 10 is a cross-sectional view of a multicolor image forming apparatus for explaining an embodiment. l, 20... Photoreceptor, 2... Conductive member, 3... Photosensitive layer, 4°... Layer containing a composite filter, 4a... ...Composite filter, 4b...
...Intermediate layer, 4C...Protective layer, 6...
...Thermal sheet, 14.21...°...Positive corona charger, 15.22...AC charger, 16.23
B, 26G, 29R...Full exposure source, FB, F
G, PR...Full exposure filter, L, Lr...
...image exposure, Lm, La, Lm...
Full exposure, 17.19, 24Y, 27M, 30c...
...Developer, 31...Transfer 'RL pole, 32.
... Separation electrode, 33 ... Static eliminator, 34.
・・・Clean/Gblade, P・・・Recording paper. Agent Patent Attorney No 1) Parent-in-law 4 years Figure 1 Figure 2 A B YuHno → Go to Figure 3 l Figure 4 Figure 8 [1] [2]

Claims (14)

[Claims] (1) An electrophotographic photoreceptor characterized by having a layer including a composite filter made up of a plurality of filter groups including a thermally transferred image containing a colorant and a transparent binder. (2) The electrophotographic photoreceptor according to claim 1, wherein the binder mainly contains resin and/or wax, and is contained in the composite filter in an amount of 50% by weight or more. (3) The electrophotographic photoreceptor according to claim 1 or 2, wherein the composite filter has a specific resistance of 10^9Ω or more. (4) The thickness of the layer containing the composite filter is 10 to 1
00 μm. (5) The electrophotographic photoreceptor according to any one of claims 1 to 4, wherein the layer containing the composite filter comprises the filter and a protective layer. (6) A step of forming a linear or mosaic thermal transfer image using a plurality of types of heat-sensitive sheets including a heat-sensitive sheet containing a colorant and a transparent binder; 1. A method for manufacturing an electrophotographic photoreceptor, comprising forming a layer containing a composite filter consisting of a group of different types of filters. (7) The method for manufacturing an electrophotographic photoreceptor according to claim 6, wherein the binder mainly contains resin and/or wax, and is contained in the composite filter in an amount of 50% by weight or more. (8) The method for manufacturing an electrophotographic photoreceptor according to claim 6, wherein the composite filter is formed on a sealed photosensitive layer, protective layer, or intermediate layer. (9) The specific resistance of the composite filter is 10^9Ωcm
The method for manufacturing an electrophotographic photoreceptor according to claim 6 or 7, which is the above. (10) The method for manufacturing an electrophotographic photoreceptor according to claim 6 or 7, wherein the layer including the composite filter has a thickness of 10 to 100 μm. (11) A process of imagewise exposing a photoreceptor having a layer including a composite filter consisting of a plurality of filter groups including a thermally transferred image containing a colorant and a transparent binder, and uniformly exposing the photoreceptor with a specific light. An image forming method comprising the steps of repeating a process of exposing to light to form a potential pattern on each corresponding filter portion and developing this with toner. (12) The image forming method according to claim 11, wherein the binder mainly contains resin and/or wax and is contained in the composite filter in an amount of 50% by weight or more. (13) The specific resistance of the composite filter is 10^9Ωc
The image forming method according to claim 11 or 12, wherein the image forming method is greater than or equal to m. (14) The image forming method according to any one of claims 11 to 13, wherein the layer including the composite filter has a thickness of 10 to 100 μm.