JPS62247376A - Method for forming digital image and its developer - Google Patents

Abstract

PURPOSE:To form a multicolored image having excellent reproducibility of a black image and high resolution and clear hue by transferring the multicolored toner image to a transfer material after forming the multicolored toner image on the image forming body. CONSTITUTION:The toner image T is formed on the toner image forming body 1 by processing an electrostatic image formed with an electrostatic forming mechanism 30, with an developing mechanism 31. The toner image T formed on the toner image forming body is transferred with pressing-out force of a pressing-out roller 34 which is placed on an intermediate transferring body at a transferring range A. The heating plate 38 of the transferring material has a shape which is suitable to contact along an outer surface of the circumference of the contacting roller 37. At the time of passing the transfer material P between the surface of the pressure roller 37 and the heating plate 38 of the transfer material, as the material P is heated at a temp. somewhat higher than the melting temp. of the toner by the heating plate 38 for the transfer material, the toner image on the intermediate transferring body 33 is sufficiently transferred and fixed on the material P.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for forming a multicolor image, particularly to a method for forming a multicolor image using a digital method, and a developer used therein.

[Conventional technology]

In recent years, in the copying industry, there has been a demand for color copies with a larger amount of information in place of monochrome copies. The reason for this is that many of the documents being processed are multicolored graphic images, or achromatic documents have various colored marks and annotations, and it is necessary to identify the content based on the type of color. be. Analog multicolor recording devices such as Xerox 6500 manufactured by Xerox Corporation, NP-Color T1 manufactured by Canon Corporation, and Nori-Two Color 5000 manufactured by Ricoh Corporation are known as devices for obtaining the color copies. The image forming process in such a multicolor recording device is as follows:
For example, after corona charging a photoreceptor, an original image is exposed through a green (G) filter, and developed with a magenta (M) developer.
The obtained magenta visible image is once transferred onto copy paper. Next, the photoreceptor is exposed to light through a blue (B) filter in the same manner as above, and after development with a yellow (Y) developer, the obtained yellow visible image is transferred. The image is transferred in accordance with the magenta image already transferred onto the transfer paper. Furthermore, the same process as above is repeated using a red (R) filter and cyan (C) developer, and the cyan visible image is transferred in line with the previous two images, and the resulting three-color image is fixed and finalized. Obtain a color copy image. That is, according to this method, the original image is subjected to BGR color separation, and each color is exposed to a photoreceptor separately to produce MMC (black if necessary).
After development, toner images are transferred one color at a time onto a transfer paper on a transfer drum to obtain a color copy image. However, in the above-mentioned analog type multicolor recording device, each color toner image is transferred each time an image is formed, so transfer misalignment occurs, resulting in poor resolution and color balance of the multicolor toner image after transfer. There's a problem. In addition, since the toner images of each color are superimposed, chromatic toner is mixed into the black image, and the pure black expression required for documents is lost.Also, it is difficult to perform highly accurate lenorstorage tanning, so the sharpness of black line images etc. There is an interlayer that is lost, etc. In recent years, with the spread of color image devices such as color CRT display devices for combinators and Videotex terminal devices, techniques for obtaining color copies directly from such devices using a digital method are being considered. In such a digital method, optical information obtained by optically scanning a document is color separated, the obtained color separation information is subjected to charge conversion and A/D conversion, and then color separation is performed according to a predetermined method, resulting in a color signal. Based on this, a multicolor image is formed by various recording methods such as a wire tod matrix recording method, an inkjet recording method, a thermal transfer recording method, an electrostatic recording method, or an electrophotographic method. According to such a digital method, black can be expressed as pure black by separating it from other chromatic colors without relying on color mixture. Generally, office color copies often include black line drawings, and it is always desired that the black line drawings be clear and free from color turbidity. Conventionally, as the above-mentioned digital multicolor image forming method, for example, at the 1981 General Meeting of the Institute of Electronics and Communication Engineers, Mr. Tajiri of Nippon Telegraph and Telephone Public Corporation and Yokosuka Electric Research Institute proposed [Multicolor reading method using a contact image sensor]. Research report titled ``Japanese Unexamined Patent Publication No. 56-162755, Japanese Unexamined Patent Publication No. 1983
There are Japanese Patent Publications No. 7-44825 and Japanese Unexamined Patent Publication No. 144452/1983. In the research report of the Electronic Communications '7 Society, there is a green LED array and a red LED array on the side of the contact image sensor on the manuscript.
A D array is arranged, and the LED array light of each color is projected onto a document, and the reflected light is received by an image sensor to obtain respective image signals. A technology has been disclosed in which these image signals are subjected to A/D conversion, then compared and processed in an arithmetic circuit to separate them into red and black color signals, and the signals are output to a transfer type two-color recording device for recording. . Furthermore, in JP-A-56-162755, when a document with a black image and a cautionary note for the black image written in red and blue is used, the black image is first processed using an electrophotographic method using an ordinary photoreceptor. A black toner image is formed on a transfer paper according to the above-mentioned method, and only the part written with the above-mentioned property 1 is copied using a digital copying method to form a color toner image, and the color toner image is transferred in superimposition on the black toner image. Multi-color copying is possible using this method. In the above-mentioned digital copying, the reflected light from the original is color-separated using blue and red filters, and the resulting color separation information is photoelectrically converted via an image sensor to obtain image signals of each color. /D conversion conversion calculation processing Red or blue record with black component removed! Get i signal. After converting this recording signal into an optical signal, an electrostatic image is formed on the photoconductor by the annotation optical signal, and then developed with a developer containing color toner to form a color toner image, which is then converted into the black toner image. is transferred onto a transfer paper carrying These image forming methods may be an inkjet method or an electrostatic recording method using a bottle electrode. Furthermore, in Japanese Patent Application Laid-Open No. 57-44825, optical information from a color original is color-separated using photoelectric conversion means having different spectral characteristics to obtain two types of color separation information, and this is charged and converted to obtain each color. An image signal is obtained, and after ^/D conversion, the image signal is calculated, the sum of the image signals of each color is calculated, and the brightness is determined from the sum signal. Separately, a logarithmic operation is performed on each of the color image signals, the hue is determined by a combination of the difference signal and the sum signal, and the signals from each of these determination means are output to an inkjet head to record a color image. ing. Sara: W111 again! Japanese Patent No. 56-144452 discloses an electrophotographic color printer. The image forming process by the printer includes uniformly charging the drum-shaped photoreceptor with a corona charger, and then
Imagewise exposure of PISl is performed to form an electrostatic image, which is then reversely developed using a developing device containing the first color toner. Next, a second image exposure, a non-contact reversal development using the second color toner, and a third image exposure, a non-contact reversal development using the third color toner are repeated, and the photoreceptor is exposed once by the photoreceptor. A multicolor toner image is formed on the body and is transferred all at once after being transferred. This technique is considered to be applicable to, for example, digital color printers that use a laser beam modulated by a video signal for image exposure. In the above-mentioned known technologies, there are various recording methods such as inkjet, thermal transfer, and electrostatic recording as mentioned above as recording methods for forming multicolor images using digital signals, but there are various recording methods such as inkjet, thermal transfer, electrostatic recording, etc., but there are various problems such as recording speed, cost, recording accuracy, and maintenance. Electrophotographic method is preferable from the point of view of difficulty in management, etc.+11°

[Problems to be Solved by the Invention] As described above, it is desirable to use a digital method and an electrophotographic method as a multicolor image forming method, and furthermore, a multicolor toner image is formed on an image forming body. However, a method of transferring this to a transfer material at once is preferable.However, as in the prior art described above, a plurality of image exposure systems and developing systems are arranged around the image forming body to produce a multicolor toner image by one rotation of the image forming body. When forming an image forming apparatus, there is a problem that a large number of image forming devices are placed close to each other, resulting in a complex and expensive structure, resulting in a very large apparatus. Furthermore, in the known electronic system, a two-component developer M consisting mainly of a carrier and an insulating toner is used, and the toner is charged by frictional charging with the carrier. Therefore, due to changes in the roughness of the developer, fatigue, fluidity, humidity, etc., the developing performance is always inconsistent and varies. In general, in WP heavy charge development using insulating toner, there is multiple layers of toner adhesion, and the upper layer toner has weak adhesion to the photoreceptor, so when electrostatically transferring it to a transfer material, uneven transfer, transfer misalignment, etc. are likely to occur. , resolution may decrease. In addition, in the digital method, the electrostatic image formed on the image forming body consists of fine dots with a particle size of several tens of microliters, for example, and these are developed with the developer.A carrier or toner of opposite polarity is placed around the dots. adheres to the dots, reducing the resolution of the dots. [Means for Solving Problem 1] The present inventors have diligently studied the above-mentioned problems, obtained the knowledge of the non-contact reversal development method disclosed in the above-mentioned U.S. Pat. No. 56-144452, and developed a digital method The present invention was completed by discovering an image forming method suitable for forming an image and a developer suitable for the image forming method.

[Purpose of the invention]

An object of the present invention is to provide an image forming method that can form a multicolor image with excellent black image reproducibility, high resolution, and clear hue when forming a multicolor image using an electrophotographic method, and a development method for the same. The goal is to provide M.

[Structure of the invention]

The digital image forming method of the present invention achieves the above object by photoelectrically converting and digitally converting a plurality of color separation information obtained by color separation of optical information, and converting the obtained plurality of digital signals into a predetermined color separation map. The first step is to perform color separation based on the color information and output a color signal, and convert the color signal into electro-optic light, write the obtained optical signal on an image forming body to form an electrostatic image, and transfer the electrostatic image to a conductive toner. a second step of developing with a developer containing as a main component to form a color toner image corresponding to the color signal, and repeating at least the second step and rotation of the image forming body a plurality of times. The main component is to form a multicolor toner image on the image forming body and then transfer the multicolor toner image to a transfer material. Furthermore, the developer for digital image formation according to the present invention converts a plurality of color separation information obtained by color-separating optical information into digital signals to photoelectric conversion M, c/, respectively, and converts a predetermined signal from the plurality of digital signals obtained. A first step of performing color separation based on a color separation map and outputting a color signal, converting the color signal into light and writing the obtained optical signal on an image forming body to form an electrostatic image; tlS2 step of developing with a developer to form a color toner image corresponding to the color signal; After forming a multicolor toner image on a forming body, the developer used in the image forming method of transferring the multicolor toner image to a transfer material is provided with a conductive toner as a main component. It is.

[Function] In addition to the effects included in the object of the invention, since the developing system is electrically conductive, it is easy to develop toner with high resolution through electrostatic induction. In addition, it has good fluidity and has excellent developability even without adding a fluidizing agent, and there is no need to charge the toner by frictional charging, so a charge control agent is required. Composition and development equipment become simpler, and materials and! ! Effects such as reduced installation cost can be achieved. In addition, when the developing method is non-contact development in which the toner is caused to fly, the developed toner image may be damaged during subsequent development, or the developed toner image may be damaged during subsequent development, or the adjacent developing device may This prevents harmful effects such as contamination of the developer due to the mixing of toner of a different color, and provides images with clear hues. Furthermore, when the development method is reverse development by selecting an appropriate development bias, the toner adheres only to the exposed area, which is suitable for digital multicolor image formation in which dot-shaped toner images of each color are superimposed. Moreover, since toner is less likely to adhere to the background area, there are advantages such as less toner consumption. DETAILED DESCRIPTION OF THE INVENTION In the image forming method of the present invention, as shown in the image forming system block diagram in Fig. mi, it is comprised of an image processing section including a reading system and a writing system, and a recording section. In the reading system, the optical information obtained by optically scanning the color development is separated into two colors, such as two types of filters, cyan (C) and red (R), a guikuroi tsukumiroru, a guikuroic prism, etc. or blue (B),
Color separation information is obtained by separating the colors into three colors using a combination of three types of filters, green (G) and red (R), or a gicroic mirror, gicroic prism, etc. This color separation information is charged and converted by a charging conversion element such as a COD image sensor to obtain an image signal, which is then A/D converted to a digital signal. These digital signals are processed in the arithmetic unit, and based on the results, the colors are separated and color signals are output. This color signal is generated by Nelr light 7y (bar tube (OFT), liquid crystal (
L CD ), light emitting diode 1'' (L E D ), laser light, etc., preferably converted into an optical signal by a semiconductor laser device. photoreceptor dispersed in
An electrostatic image is formed by writing onto an image forming body such as an organic photoreceptor, a selenium-based photoreceptor, or a 7M silicon or amorphous derma photoreceptor. This electrostatic image is developed by a developing method such as a magnetic brush method, a seven-arp brush method, a powder cloud method, etc., preferably in a non-contact manner, using a developer whose main component is a conductive color toner corresponding to the color signal. A toner image is formed. The steps including reading, writing, and recording described above are repeated for the number of color-separated signals to form a multicolor toner image in which toner images of each color are superimposed on the image forming body, such as pressure transfer, adhesive transfer, etc. The image is transferred to a transfer material by the method described above and fixed by heating or pressure, or if necessary, transferred and fixed at the same time. Note that the digital image forming member method of the present invention is not necessarily limited to multicolor toner images; for example, a single toner image of black, blue, or red is formed by one pass of the image forming member,
This also includes the case of transferring and fixing to form a black, blue or red image. Here, the conductive toner is a conductive magnetic toner in which a conductive magnetic material, a colorant, and, if necessary, a conductive agent are dispersed in a thermoplastic or thermosetting binder resin, or are adhered to the surface of the toner particles. However, if the conductive agent is attached to the surface of the magnetic toner, a more conductive toner can be obtained. However, when forming a multicolor image, it is better to use a non-magnetic conductive toner that does not contain magnetic substances that reduce the coloring of the toner, and furthermore, the conductive agent contained in or on the surface of the toner particles is transparent and colorless. Alternatively, it is preferably white. Here, the volume resistivity of the conductive toner according to the present invention is 10'2
Ωcj or less, preferably 1010 Ωcm or less. When developing by applying a bias voltage, it is preferable to use a higher resistance. Note that the specific resistance of the toner carrier is 0.5e for particles.
After placing the particles in a container with a cross-sectional area of 12 and tapping, a load of lkf/ell' is applied to the packed particles,
It is determined by applying a voltage that generates an electric field of 102 to 10'V/cj between the load and the bottom electrode, reading the current value flowing at that time, and performing a predetermined calculation. Examples of the piping resin used in the toner include addition polymerization type resins such as styrene resin, styrene-acrylic resin, styrene-butadiene resin, and acrylic resin, condensation polymerization type resins such as polyester resin and polyamide resin, and epoxy resins. I can give an example. Among these resins, monomers for forming addition polymerization type resins include styrenes such as styrene, 0-methylstyrene, so-methylstyrene, p-7 styrene, and 3,4-dichlorostyrene; Ethylenically unsaturated monoolefins such as ethylene, propylene, butylene, and isobutylene; vinyl chloride, vinylidene chloride, vinyl bromide,
Vinyl halides such as vinyl fluoride; vinyl esters such as vinyl acetate, vinyl probionate, vinyl benzoate, vinyl butyrate; methyl acrylate, ethyl acrylate, isobutyl acrylate, isobutyl acrylate, propyl acrylate, acrylic acid n-octyl, dodecyl acrylate, lauryl acrylate, 2-ethylhexyl acrylate, n-octyl methacrylate, dodecyl methacrylate, uturyl methacrylate, 2-ethylhexyl methacrylate, stearyl methacrylate, methacrylic acid α- such as phenyl, trimethylaminoethyl methacrylate, trimethylaminoethyl methacrylate, etc.
Methylene aliphatic monocarboxylic acid ester; Acrylic or methacrylic acid derivatives such as acrylonitrile, methacrylonitrile, and acrylamide; Vinyl ethers such as vinyl methyl ether, vinyl ethyl ether, and vinyl isobutyl ether; Vinyl methyl ketone,
Vinyl ketones such as vinyl hexyl ketone and methyl isopropenyl ketone; Monomer; propanoene, bugnoene, isoprene, chloroprene, pentanoene,
Examples include olefin monomers such as hexanoene. These monomers can be used alone or in combination of two or more. Examples of monomers for forming the condensation type resin include ethylene glycol, triethylene glycol, and 1,3-propylene glycol. In addition, as magnetic powder for imparting magnetism and other conductivity to the toner, triiron tetroxide, γ-ferric oxide, chromium dioxide, nickel 7-erite, iron alloy powder, etc. with a spacing of 0.1 to 1 μm are used. It is contained in an amount of 0 to 80 wt% based on the toner. In addition, dyes or pigments used as toner colorants include black dyes or pigments such as carbon black, aniline black, lamp black, blue dyes or pigments such as niathalocyanine blue, methylene blue, Victoria blue, methyl violet, aniline blue, and red dyes. Or pigments: Rhodamine 6G Lake, Watching Red, Rose Bengaru, Rhocumin B. Examples include alizarin lake. Further, as the conductive agent suitable for the conductive toner of the present invention, 4
class ammonium salt, copper iodide, tin iodide, conductive zinc oxide,
There are titanium oxide, tin oxide, etc., and the binder resin has 4
It is also possible to make a conductive TJF resin by combining a grade ammonium base, a sulfonated metal base, etc. In such a case, a conductive agent is not required and a conductive color toner can be made by simply incorporating a coloring agent. In order to produce the conductive magnetic toner according to the present invention, the composition containing the above-mentioned materials is usually thoroughly mixed, and after being heated, the composition is cooled, pulverized, and classified to have an average particle size of 1 to 20 μl, preferably 3 to 15 μl.
The particles may be made into μl particles, but if necessary, they may be further heated to make them spherical. Alternatively, the binder resin may be mixed with magnetic powder, dyes or pigments, conductive agents, etc., and granulated and polymerized with stirring. The conductivity can be improved by coating the surface of the toner particles with a compound such as M or the like. The toner thus obtained may be used as it is as a developer, or it may be made into a developer by adding a brightening agent, a fluidizing agent, etc. Next, when the developer contains non-magnetic conductive toner as a main component, a 7-arbrush developing device shown in FIG. 2, for example, is used. In the figure, 1 is an image forming body that rotates in the direction of the arrow, 2 is a hopper that accommodates the developer D1, 3 is a fur brush ring (t-roll) that rotates in the direction of the arrow, 4 is a 7-ar brush, and 5 is a fur brush that rotates in the direction of the arrow. Developer supply roller, Dl
6 is a developer made of non-magnetic conductive toner, 6 is an applicator blade that regulates the amount of developer supplied by the developer supply roller 5, 7 is a sealing member to prevent leakage of the developer, and 8 is a bias power source. In this developing device, hopper 2
The developer inside is supplied in a fixed amount to the developing roll 3 through a developer supply port 5. The developer supplied here is held by a fur brush that rotates in the direction of the arrow, and is applied from the Fl source 8 under the field of inertia, which develops the electrostatic image on the image forming body that rotates in the direction of the arrow in a non-contact manner. be made to do. FIG. 3 shows an apparatus similar to a conventional magnetic brush developing apparatus in which the developer mainly contains magnetic conductive toner.
20, a sleeve rotating in the direction of the arrow; 21, a magnetic body with N and S8 poles rotating in the opposite direction; 22, a magnetic brush formed on the sleeve 20; 23, a hopper;
24 is a developer layer regulating blade, 25 is a developer leakage prevention plate, and 26 is a power supply for the sleeve 20. However, the magnet body 21 does not necessarily need to rotate, and may be fixed. In order to go up to this developing device and develop it, the development 'tTI D 2 in Ho 7 < 23 has to be rotated by the magnet body 21. being conveyed by the sleeve 20 while being formed;
50 to 5 by the developer layer regulating blade 24 during the conveyance process.
It is regulated to a thin layer of 00 μl and transported to the development area. A bias voltage in which a direct current and an alternating current are applied as necessary is applied to this developer layer from a bias voltage [26].
The electrostatic image on the image forming body 1 is developed in a non-contact manner by using a gap d that is thicker than the thickness of the developer layer. Next, in order to transfer the toner image formed on the image forming body 1 to a transfer material, it is difficult to use electrostatic transfer as in the case of insulating toner images because the toner has a low charge retention ability. Therefore, the toner image formed on the image forming body 1 is transferred to a transfer material via a pressure roller and then fixed at a constant X1 by heating or pressure, or it is fixed by heating or pressure at the same time as the transfer. In this way, when transferring a conductive toner image onto an image forming body using a pressure roller, sufficient strength is required on the surface of the image forming body. It is preferable to use a 7 As silicon photoreceptor, for example, amorphous hydrogenated/nitrided silicon, 7 mol 77 hydrogenated carbonated silicon, etc.Furthermore, a semiconductor may be used in the writing system during image formation. When using a laser beam, it is preferable to use a 7M silicon-dermanium photoreceptor. However, the amorphous silicon photoreceptor is still in the process of research and development. Therefore, a selenium-based photoreceptor, which is easily damaged by pressure contact, is usually used. or an organic photoreceptor, etc., the transfer method using the pressure roller has a practical problem.Therefore, in Fig. 0, a transfer device using an intermediate transfer member as shown in Fig. 4 is preferably used. , along the outer peripheral surface of the rotating drum-shaped toner image forming body (image forming body) 1 r:,
In the la area, the electrostatic image forming mechanism 30, the developing mechanism 31, and the cleaning fi 411az are provided in this order in the rotational direction, and the developing 8! In the copying area A between the mechanism 31 and the cleaning mechanism 32, an intermediate transfer body 33 made of an endless belt is pressed against the toner image forming body 1 by a pressing roller 34.
is pressed against the outer peripheral surface of the This intermediate transfer body 33 has a pressing roller 34, a heating roller 235, and a tension roller 36.
The toner image forming member 1 is suspended in the transfer area A and moved at a constant speed in the same direction as the toner image forming member 1 toward the intermediate transfer member heating area B of the heat roller 35 . Separation of the intermediate transfer body 33 from the heat roller 35;
In the transfer fixing area C at or near the
A pressure row 237 is provided to be pressed against the heat roller 35. A transfer material heating plate 38 is disposed along a transfer material heating area immediately before the transfer fixing area C in the transfer material moving path of the transfer material P made of transfer paper, which is set to pass through the transfer fixing area C. has been done. In the present invention, using the apparatus configured as described above, the toner image formed on the toner image forming body 1 is finally transferred and fixed onto a transfer material in the following manner. First, the toner image T on the toner image forming body 1 is developed by developing the g-electroimage formed by the electrostatic image forming mechanism 30 ! It is formed by developing with the structure 31. That is, when using an electrophotographic method, the toner image forming body 1 is composed of a selenium-based, organic compound-based, zinc oxide or cadmium sulfide-based paint type or other electrophotographic photoreceptor,
After the entire outer peripheral surface of the toner image forming body 1 is charged by the frP electrostatic image forming structure 30, an electrostatic image is formed by performing exposure with a laser beam obtained by converting the recording signal shown in FIG. 1 into an optical signal. form. When using the Seiden recording method, the toner image forming body 1 is composed of a dielectric material consisting of a conductive base and a dielectric surface layer, and the recording signal shown in FIG. 1 is transmitted using a multi-stylus electrode or an ion control electrode. An electrostatic image is formed by converting it into a electrostatic latent image. When a magnetic recording method is used, the toner image forming body 1 may be made of a magnetic material, and the recording signal may be converted into a magnetic signal by a magnetization head to form a magnetic latent image. When the image formed in this manner is a g-electromagnetic image, the conductive toner that has been inductively charged to the opposite polarity by the charges forming the electrostatic image by the developing mechanism 31 is processed using, for example, the 7 Arplash development method. , a powder cloud development method, a magnetic brush development method (in the case of magnetic toner), etc. to form a toner image. The toner image T formed on the toner image forming member 1 as described above is transferred in the transfer area A by the pressing force of the intermediate transfer member upper pressing roller 34. Here, the intermediate transfer member 33 includes a transfer layer made of a heat-resistant elastic material such as silicone rubber or Teflon-based rubber, and a heat-resistant base material such as stainless steel copper plate, polyimide, polyimideamide, polyamide, polyester, polyacrylate.
) A heat-resistant film made of resin Q, for example (U
It is formed by a laminate with a heat-resistant polymer film such as "Sheet" (manufactured by Taihei Kagaku Co., Ltd.), and the material of the transfer layer is particularly preferably room-temperature vulcanization type or low-temperature vulcanization type silicone rubber. 0 e.g. rL T V 1300J, r
L T V1800J (both manufactured by Shin-Etsu Chemical Co., Ltd.) is
It is an addition polymerization type silicone rubber, and is a particularly preferable material for the transfer layer. These silicone rubber layers are
At low temperatures, due to the moderate tackiness of the surface and the rubber elasticity that contains the toner, it is possible to overcome the toner retention force of the toner image forming body l and sufficiently capture the toner on the intermediate transfer body 33 side in the transfer area. Since its surface energy is sufficiently small compared to ordinary transfer material materials, the toner is heated from the surface of the transfer material P side in the pine fixing 'WI area C, which will be described later, and becomes fluid. When the transfer material is brought into pressure contact with the toner, the toner strongly adheres to the transfer material and is almost completely transferred and fixed onto the transfer material. Then, by the heat roller 35, the toner image T
Since it is preferable that the intermediate transfer material 33 is heated at a high speed, the thickness of the transfer layer and the substrate is preferably as small as possible within the range that provides the desired performance. For example, the thickness of the transfer layer is 1.
The optimum thickness is 0 to 500 μl, and the thickness of the substrate is 10 to 500 μl. Note that the intermediate transfer material 33 is not limited to an endless belt, but may be one in which a transfer layer is provided on the surface of a hollow roller made of aluminum or stainless steel, and a heater is further provided inside. The heat roller 35 has a built-in heater 35^ made of, for example, an infrared lamp inside a hollow metal roller made of aluminum or the like, and controls the temperature of the surface of this metal roller to an appropriate range, thereby increasing the temperature of the endless belt. At the start of contact with the intermediate transfer body 33, αE and the visible area of the transfer fixing area C, that is, the intermediate transfer body heating area B, j! ! [The intermediate transfer body 33 consisting of an end belt and the toner image T thereon are heated to a temperature lower than the solvent temperature of the toner. Here, the temperature of the intermediate transfer member 33 is preferably as low as possible if transfer and fixation is sufficiently performed on the transfer material P in the transfer fixing area C. This is because the temperature of the intermediate transfer member 33 becomes higher. At the transfer head A, the toner image forming body 1 is heated by the heat of the intermediate transfer 33, and the performance of the toner image forming body 1 at low temperatures is reduced, and at the same time, the toner or the material components of the intermediate transfer body 33 are This is because image deterioration occurs due to transfer onto the image forming body 1. Therefore, if intermediate transfer body 3
When the temperature of No. 3 becomes high, it becomes necessary to perform forced cooling in front of the transfer surface area A as in the conventional method. As the pressure roller 37 in the transfer fixing area C, a heat-resistant elastic roll provided with a surface layer of silicone rubber or the like is used. Further, the transfer material heating plate 38 in the illustrated example has a shape adapted to contact along the outer peripheral surface of the pressure roller 3), and the transfer material P is heated between the surface of the pressure roller 37 and the transfer material heating plate 38. When the toner is passed through the transfer material P, the transfer material heating plate 38 heats the toner to a temperature slightly higher than the melting temperature of the toner. The image is sufficiently transferred and fixed. Here, the friction coefficient of the surface of the pressure roller 37 is greater than that of the surface of the transfer material heating plate 38 (therefore, as the surface moves due to the rotation of the pressure roller 37, the surface of the fixed transfer material heating plate 38 The transfer material slides and is heated by contact, and is conveyed to the transfer fixing area C. The transfer material heated in this way is transferred to the intermediate heated roller 235 together with the toner image in the transfer fixing area C. The transfer body 33 and the pressure roller 37 sandwich and press each other, and as a result, at least the side of the toner in the toner image that contacts the transfer material P is melted by the heat from the transfer material, and is further pressed in this state, so that the transfer is performed. The transfer material P is reliably transferred and fixed onto the material P. The transfer material heating plate 38 is, as in the illustrated example,
It is most preferable to heat the transfer material in contact with the surface of the transfer material P. However, in this case, it is important that the coefficient of friction between the transfer material heating plate 38 and the transfer material P is small. It is effective to coat the surface with a material having a low coefficient of friction, such as 7) base material. For example, coating materials such as aluminum or stainless steel 95 with resins such as polytetrafluoroethylene, barfluoroalfkin resin, polyfluoroethylene propylene, etc., or mixing and dispersing metal powder, inorganic oxides, etc. in such resins. For example, coating with ``Rulon'' (Dinox Sol), or impregnating a porous material with hard alumite treatment with Teflon, or treating it with 7-ram treatment are particularly excellent in terms of wear resistance, low coefficient of friction, and other aspects. In addition, those coated with the above-mentioned coating or 7-ram treatment have a low surface energy and do not accumulate dirt such as toner, and are excellent in this respect.Furthermore, metal plates with a mirror surface due to hard chrome plating are also available. This is a preferred material. *As the heater for the photographic material heating plate 38, a root-shaped heater is preferred. A PTC plate made of a resistance heating element with positive temperature characteristics does not require temperature control and is advantageous in terms of power consumption. It is preferable that the transfer material heating plate 38 contacts the transfer material P as described above, but it may be made to partially contact the surface of the transfer material P, or if it is in a very close state. , it is possible to obtain a sufficient heating effect without necessarily contacting the surface of the transfer material P. In this case, the distance from the surface of the transfer material P is usually 3ai+ or less. Alternatively, a pinch roller system using a heat roller can be used for transfer. It is also effective to heat the transfer material P by providing it before the fixing area C.The transfer material P that has passed through the transfer fixing area C is usually transferred to the intermediate transfer body 3.
3, and is separated from the intermediate 111i:1g integral 33 by the tensitan roller 36. Here, if the diameter of the tension roller 36 is made small, the transfer material can be easily separated from the intermediate transfer body 33.
By further swinging, r) it is also possible to prevent the intermediate transfer body 33, which is an endless belt, from shifting. The intermediate transfer material 33 that has passed through the busy imaging area C is naturally cooled, undergoes transfer again in the transfer area A, and then repeats the transfer and fixing process in the transfer and fixing area C. Note that as the intermediate transfer body 33 of the transfer device, a transfer roller having a built-in heat source can be used instead of the transfer belt. Next, an image forming method including a step of developing with a developer containing the conductive toner as a main component will be described in more detail using a specific image forming apparatus. FIGS. 5 to 8 are diagrams for explaining the image forming apparatus, and FIG. 5 is a cross-sectional view showing 61 components of the image forming apparatus. mG diagram is color separation and light 1! Partial side view representing the converter, PtS
FIG. 7 is a sectional view showing the laser and optical system for writing, and FIG. 8 is a graph showing the spectral characteristics of the original scanning light and the CCD color scanner. In the PtS5 diagram, A is a reading unit, B is a writing unit, C is an m-image forming section, and D is a paper feeding section. In the reading unit A, the platen 41 is a lath, and the original 42 is placed on this platen plus 41. The document 42 is illuminated by fluorescent lamps 45 and 46 provided on a carriage 44 that moves on a slide rail 43. The movable mirror unit 48 is provided with a second mirror 49^ and a third mirror 49[1, which move on the slide rail 43, and which are provided on the carriage 744.
In combination with the mirror 47, the platen guides the optical image of the document 42 on the lath 41 to the lens reading unit 58. The carrying horn 44 and the movable mirror unit 48 are driven by pulleys 51 , 52 , 53 , 54 . ■ and 1 respectively
/2V in the same direction. Platen is at last 4
Standard white plates 56 and 57 are provided on the back side of both ends of the scanner 1, and are configured so that a standard white signal can be obtained before the start of original reading scanning and after the end of scanning. The lens reading unit 58 includes a lens 59 and a prism 6.
0, first reading board 62, red charging CCD 63, second
It is composed of a reading board 64 and a cyan color CCD 65. First mirror 47. #2 mirror 49^, 3rd
The g-image light image transmitted by the mirror 49B is transmitted to the lens 59.
The prism 60 constituting the prism 60 is focused by
A guichroic mirror 61 provided at the junction between a and 60b separates the light into a red light image and a cyan light image, and r
C for red light provided on jSl 3i cutout board 62
Images are formed on the receiving and light surfaces of the CD 63 and the cyan color CCD 65 provided on the second reading board 64, respectively. The fluorescent lamps 45 and 46 are commercially available warm white fluorescent lamps used as a light source when reading a color document to prevent emphasis or destruction of specific colors, and 40 KHz high frequency lamps are used to prevent flickering. ! ! Lighted up by the source W! ! ! It is kept warm by a heater using a Ponosta to maintain a constant temperature or to increase the temperature. CCD 63 for red light and CCD 65 for cyan light
The image signal outputted from the signal foil F! ! be done. In the color separation section, color signals separated according to toner colors, which will be described later, are output and input to the writing unit B. Writing 22) B is vI omitted as shown in figure M7,
A laser beam generated by a semiconductor laser 71 is rotated and scanned by a polygon mirror 72 rotated by a drive motor 70, passes through an Fθ lens A bright line 79 is formed. 74 is an index sensor for detecting the start of beam scanning, and 75 and 76 are cylindrical lenses for correcting the inclination angle. 78a, 78b, 7
A reflecting mirror 8c forms a beam launch optical path and a single beam detection optical path. When scanning begins, the beam is detected by the index sensor 74, and modulation of the beam by the first color signal begins. The modulated beam scans the photosensitive drum 80, which has been uniformly charged in advance by a charger 81. A latent image corresponding to the first color is formed on the drum surface by the main scanning by the laser beam and the 1alJ scanning by the rotation of the photosensitive drum 80. This latent image is formed by, for example, a developing device 83 filled with VC of red toner.
A toner image is formed on the drum surface (Fig.fjS5).The obtained toner image passes under the cleaning *m87 which is separated from the photoreceptor drum surface while being held on the drum surface. Then, the next copy cycle begins. The photosensitive drum 80 is charged again by the charger 81. Next, the second color signal output from the color separation section is input to the writing unit B, and is written on the drum surface in the same manner as the first color signal to form an electrostatic image. be done. The electrostatic image is developed by a developer 84 loaded with toner of a second color, for example blue. This blue toner image is formed over the already formed red toner image. 85 is a developing device having black toner, which forms black toner (t) on the surface of the Y ram based on a control signal generated by a signal processing section.These developing devices 83, 84, and 85 are all shown in FIG. A 7-arbrush developing device with !R construction, 83a
, 84a, 85a are seven arbrush developing rolls, 83b. Reference numerals 84b and 85b are supply rollers for supplying a fixed amount of developer to each of the developing rolls. A bias power source 86 applies an AC bias and a DC bias to the developing roll to cause the conductive toner in the developing device to fly toward the image forming body 80 for non-contact and reverse development. If the frequency of the alternating current or pulse bias for non-contact development of the conductive toner is too low or the pressure is too high, leakage discharge is likely to occur.
0Hz~10kllz, 50~100OV(I'-r'
). Further, the DC bias for reversal development has the same polarity as the electrostatic image and a value close to the potential of the eML image. Note that development is possible without applying alternating current or pulse bias. The thus developed multicolor toner, in which a red toner image, for example, according to the first color signal, a blue toner image, for example, according to the second color signal, and a black toner image according to the third signal are superimposed. The image is transferred onto a recording material (recording paper) P by a transfer device using the intermediate transfer body described above with reference to FIG. That is, the multicolor toner image is transferred from the paper feed cassette 90 to the paper feed roller 9.
1; Record 1#P transported at the same time as this
Above, an intermediate transfer body 93, a pressure roll 94, a heat roll 95
, a tensile roll 96, and a pressure roll 97, the transfer device 9z transfers and fixes the paper based on the method explained in FIG.
b is discharged in the direction of the arrow. Note that when forming a color image by transferring a multicolor toner image using an intermediate transfer body, it is recommended to use an image forming device with the same configuration (same optical system) as a general electrostatic transfer type. Since the color image obtained by inversion in the body becomes the WL image, it is controlled by, for example, reversing the reading order of the CCVs 62 and 64 or reversing the reading order from the memory. In this transfer step, if necessary, the charge on the photosensitive drum 80 is removed before transfer, or conversely, a pre-transfer charge is applied to facilitate transfer. A cleaning device fi 87 comes into contact with the photosensitive drum 80 after the transfer, and performs cleaning by a plate 1' 88 to remove unnecessary toner from the drum surface. The roller 89 of the cleaning device is used to remove a small amount of toner that may be left behind between the drum surface and the blade when the blade 88 leaves the drum surface in preparation for the next exposure and development after cleaning. While rotating in the reverse or forward direction, the contact portion with the drum surface is rubbed to collect residual toner. In addition, the light that optically scans the original! ! The spectral characteristics of 45 and 46 are shown in Figure 8 (a), and the horizontal lines in the figure indicate wavelengths (nm
), the vertical axis represents the relative intensity (%), and the spectral characteristics of the chromic mirror 61 for color separation are shown in tIS8 diagram (b), and the horizontal axis of the same diagram represents the wave 1 (nm). , vertical pongee represents transmittance (%), which rises around 550 to 600 ns+. Furthermore, the spectral characteristics of the CCD image sensor for photoelectric conversion are shown in the PAs diagram (c), and the horizontal axis of the diagram is the wave jE.
(nm), and the vertical line represents relative sensitivity (%). Note that the order of development by the developing devices 83, 84, and 85 does not necessarily have to be in this numerical order; for example, the developing device fi84 is activated by the first color number to form a blue toner image, and then the blue toner image is formed by j@2. Developed using the color signal of vcW183
forming a red toner image on the blue toner image;
The black toner image may be formed by operating the developing device 85 last, or the black toner image may be formed first. Next, the reading section ^ in the image forming apparatus for the tIsS diagram (refer to the ff51 diagram reading system) will be described in more detail. 9 to 14 are diagrams for explaining the reading section A, in which FIG. 9 is a color separation map, PtSi2 is a diagram showing an example of a ROM table, FIG. 11t2I, FIG. 12, and FIG.
The figure is a block diagram showing the reading process of the reading section A, and FIG. 13 shows the color separation map introduced into each color ROM table in the process. The reading process of reading A is shown in FIGS. 11, 12, and 14, but before explaining it, an example of a color separation means suitable for the present invention will be explained with reference to FIGS. 9 to 14. The optical information obtained by optically scanning the color original W441 in FIG. 5 with the light sources 45 and 46 is such that the red light component thereof passes through the guichroic mirror 61 and is emitted from the prism 60a.
On the other hand, the cyan color light component is reflected and emitted from the prism 60b. The obtained color separation information is photoelectrically converted by the red CCD 63 and the cyan CCD 65, and is normalized so that the output value when optically scanning the standard white plates 56 and 57 is 1.0. and cyan image signals are obtained. These normalized red and cyan image signals are designated as vR and Vc, respectively, and are converted into, for example, 6-bit/7-bit digital signals by a ^/D converter, and the subsequent performance processing is performed easily. do. A preferred coordinate system N4 for color separation is created using the digital signals V and Vc of each color thus obtained, and the created color separation map is used as a color separation means. The following points are taken into consideration to determine this coordinate system. ■In order to be able to express halftones, information on the reflectance (reflection density) of the document, which corresponds to the brightness signal of the TV, is incorporated. ■Incorporate information on color differences (including hue and saturation) of red, cyan, etc. From the above, it is preferable to use, for example, the following as the luminance signal information and color difference signal information. Shining It (H issue'f? 1 report (5 hits) = Vpt + Ve
(1)” RI V c (0≦v8≦1.0
, O≦Vc≦1.0)+7) Sum vR+Vc (0≦v
, +Vc≦2.0) corresponds to black level (+0) and white level (+2.0), and all colors exist in the range from 0 to 2.0. Color difference signal information (5 bits) = VR/ (VR+Vc) and 1. t Vc/ (VR+
(Vc) (2) In the case of achromatic color, the whole (V
The proportions of V, component, and vc component included in H+Vc) are constant. Therefore, VR/(VR+VC)=0.5 Vc/(VR+Vc)=0.5. On the other hand, in the case of chromatic colors, VR/(VR+
The value of Vc) or Vc/(V*+Vc) is one measure of the hue and saturation of the original. That is, (1) red color 0.5<V*/(V*+Vc)≦1.00', Vc
/(V*+Vc)<0.5(2)Cyan color O≦VR/(VR+VC)<0.50.5<V
It can be expressed as c/(V*+Ve)≦1.0. From this, the coordinate axes are VR + Vc to VR / (VR
+ Ve) Mata Ve/(V*+Vc) Toss all 2 axes 8!
Chromatic colors (red colors, cyan colors) by using a standard system
, it becomes possible to clearly separate shadowless colors. FIG. 9 is a diagram showing an example of a color separation map in which the color gamut is divided according to the color separation method described above. In the figure, Boku Tsumugi shows color difference signal information Ve/(VFj+Vc), the left R axis shows luminance signal information Vp+Vc, the right vertical axis shows reflection by achromatic color, and 0 color difference signal information = 0. There is an achromatic color in the 5 neighborhood (for example, a width of 0.70 to 0.30) and the area where the luminance signal information is small (the needle line area in the figure), and the area smaller than 0.5 is reddish, and the area larger than 0.5 is achromatic color. The area has a cyan color. In addition, since there is a correspondence relationship as shown in the figure between the reflection density and the luminance signal information Vg+Vc, in the example shown in the figure 0, which is easily connected directly to the output value, the horizontal axis shows VC/(VR+Vc) as the color difference signal information. ), but v8/(VR
+Vc), the effect is the same. FIG. 10 shows an example of a ROM table in which the color separation map is set, and this has a capacity of 1024 words x 4 bits (assuming 1 word is 4 bits), and the number of address bits is 1024 words x 4 bits. is the row address (VR+V
c) 5hi, -/ ) column address X VC/(VR+Vc)
It is believed that there were 5 people. This ROM table stores quantized hexadecimal density corresponding values (4-bit pattern) obtained from the reflection density of the original. In an actual image processing device, FIG.
), the cyan thread color separation map shown in Figure 13 (1)), and the red color separation map shown in Figure 13 (e) are used, and these are the black ROM table, cyan ROM table, and red color separation map, respectively. Set in the ROM table. Note that the red and cyan ROM tables are integrated into a red-cyan ROM table due to the nature of the color separation method and for the purpose of reducing the cost of the device. The luminance signal Vp+Ve and the color difference signal Ve/(V*+
Vc) as an address, read out the density corresponding value stored in the corresponding li area and read out the density corresponding value ν, and divide the read density corresponding value by 2 at the threshold specified for each color gamut by the color select signal.
The converted value is used as output data. It should be noted that the output does not necessarily have to be a binary output, and may be a multi-value output. FIG. 11 is a configuration block diagram showing an example of the reading process in the reading device A. In the figure, 101 is a first CCD that receives red color optical information, 102 is an fjS2 CCD that receives cyan color optical information, and 111 is a first amplifier that amplifies the photoelectric conversion output of the first CCD 101. , 112 is a second amplifier that amplifies the photoelectric conversion output of the second CCD 102. fjS1 and V2nd CO
The D 101 and 102 constitute a photoelectric conversion means 100, and the first and second amplifiers 111 and 112 constitute an amplification section 110. 121 is a first ^/D converter that converts the output of the first linear amplifier 111 into digital data at equal intervals, and 122 is a second ^/D converter that similarly converts the output of the second linear amplifier 112. In the converter, these first and PJ
2 ＾/D converter 121゜122 and ＾/D converter 12
Configure 0. The number of bits of the ^/D converters 121 and 122 is, for example, about 6 bits. 131 is the output of the first ^/D converter 121 and the second ^
An arithmetic processing circuit that receives the outputs of the /D converter 122 and performs arithmetic processing to normalize them; 132 is VFI+V;
A first memory 133 stores the result of calculating Vq+Vc in advance based on the digital image signals vF1 and Vc of red and cyan colors.
Similarly, with C/(VR+Vc) memory, Vc/(V
This is the second memory in which the liquid results of R+Vc) are stored, corresponding to the input cuff 1' and X2.
The value of VC/(VR+Vc) is output. 141 is the memory (red-cyan ROM table) of tjS3 that outputs chromatic color (red, cyan) data using the outputs of the first and second memo 17132.133 as addresses, and 142 is the memory of the same<fjSl and Pt52. 13
With the output of 2,133 as the address, the receiver is achromatic (:A,
The fourth memory (black RO
M table). 1st and @2 memo 17132,
133 constitutes a color separation information creation means 130, and fjS
Concentration information with 3rd and 4th memories 141°142! 1 storage means 140. 103 is a first buffer γ that temporarily stores the output of the memo+7141 of fJS3, and 104 is a second buffer that temporarily stores the output of the fourth memory 142. 105
is the color select circuit that receives B (black/black) B (blue/blue) R (red/red) select) ff1, and its output is! It is applied to YS1 and the second buffers 103 and 104. The output of either of these Pt51 and the second buffers 103 and 104 is the output of the device shown in the figure. The numbers in the figure indicate the number of bits of the signal line. The operation of the device configured as described above will be explained as follows. The optical information of the color original is incident on an optical means as shown in FIG. 6, and is separated into a red component and a cyan component. The optical information of the decomposed red component and cyan component is each COD.
101 and 102 and is converted into an electrical signal. f:
The converted image signals enter amplifiers 111 and 112 and are amplified to a predetermined level, and then the following ^/D'f
: Converted to digital data by converters 121 and 122. The arithmetic processing circuit 131 receives the red and cyan image data converted into digital data and normalizes it using the output value of the reference color (white). That is, the image data of the reference color is 1.
The red and cyan image data are normalized as 0. The image data normalized in this way are respectively referred to as VFL@Vc. These normalized image data V@@Ve are already ■R
+Vc (sum) and C/ Ve/ (VFI+ VC) (
The input address is input to the first memory and the memory of tjS2 in which the data of the ratio) is stored, and the corresponding sum and ratio data are output. And these first and P
The outputs of the memories 132 and 133 of t52 are the third and fourth (/fourth)
Memo 17141.142 is given as an address signal. 13. The density corresponding values stored at addresses corresponding to the input addresses are outputted from the fourth memories 141 and 142 and held in buffers 103 and 104, respectively. On the other hand, the color select circuit 105 receives the o, c, and n signals and provides a select signal to either Pt41 or the second buffer 103 or 104. For example, when the first buffer 103 is selected, the density corresponding value of red or cyan is output, and when the l buffer 104 is selected, the density corresponding value of the black system (white, gray, black) is output. Output. The output density-corresponding data is binarized by a binarization circuit (not shown) using thresholds set for each color gamut.
Converted to value data (multi-value data in some cases). This binary data is input to a writing section, and a laser beam modulated by the data is used to write onto the image forming body, thereby forming an electrostatic image. this? The IP electric image is developed by a developing side corresponding to the selected color signal to form a color toner image. The above operations are repeated every time the CCDs 101 and 102 receive optical information. FIG. rjS12 shows a block configuration diagram in which the first memory (sum memory) and second memory (ratio memory) in FIG. 11 are deleted to simplify the process. That is, the denotated red and cyan image data is normalized and the sum and ratio calculations are performed in the arithmetic processing circuit 131. The input addresses are input to the ROM table 141 and the black ROM table 142 in which the black color separation map is set, and the density corresponding values of each color stored at the address corresponding to the address are output and sent to the buffers 103 and 142, respectively.
It is held at 104. Thereafter, the held color density corresponding values are selectively outputted by the select signal, and after being converted into z-values, writing and recording on the image forming body are performed to form a multicolor image. In the above explanation, VC/(VR+Vc) was used on the horizontal axis of the color separation map shown in FIG.
R+VC). The same effect on the horizontal axis can also be obtained by plotting (Vp-Vc)/(V*10Vc) or (Vc-Vp)/(VR+Vc) on the horizontal axis. For example, on the horizontal axis (VR-
If Vc)/(V*+Vc) is used, (VR-Ve)/(VR+Vc) = 0. For example, in the vicinity of ±0.3, achromatic color>0 reddish 0 cyanish. Furthermore, in the above explanation, a red transmitting and cyan reflective type was used as the spectral characteristics of the guichroic mirror.
The present invention is not limited to this. Further, the color separation means is not limited to a guichroic mirror, but may be any device that separates colors. For example, it could be a spectral filter, or a color separation map? It is not limited to the T-shaped shape as shown in Figure tS9, and any shape may be used. In the explanation above, the arithmetic processing circuit 131 is required, and the VF
The case where the I+Vc and Ve/(VR+Ve) calculations and the normalization calculation of the outputs of the 1 or ^/D converters 121 and 122 are performed is taken as an example. However, the present invention is not limited to this, and the memo 17132.133 may be addressed immediately with the output of the ^/D converter 121.122. In this case, the memories 1:l12 and 133 are each input address VRIVe. Corresponds to L TE V* + V
A ROM in which data having c v Ve/(VR+Ve) characteristics is written is used, and the ^/D converters 121 and 122 are set to a full value of 1.0 when the image data of the reference white board 56, 57 is input. The arithmetic processing circuit 151 becomes unnecessary if full scale adjustment is performed in advance inside the F/D converter so that scale (FS) data is output. The reading process of such a configuration is shown in FIG. That is, the normalized digital signal from the ^/D converter 120 does not pass through an arithmetic circuit as shown in Figure fjS11, but the sum (VH+Vc) and ratio (Ve/VR+Vc) data are written in advance. Vp+Vc/Mo') -132(
PISl/Mo') -) and (/Vc/V, 133(P
A2 memory) is input as an address, and data corresponding to the address is output. The output data is a red-cyan ROM table 14 in which chromatic color density corresponding values are stored.
1 is input into the black ROM table 142 (fourth memory) (m3 memory) and the black density corresponding value is stored, and color separation is performed. The density data stored in the address corresponding to the input address is output from each of the ROM tables and held in the buffer y 103 (buffer 71) and the buffer 7 r 104 (buffer 72), respectively. On the other hand, the color select circuit 105 receives the B, B, and R signals and provides a select signal to either the first or second buffer 103 or 104. For example, when the first buffer 103 is selected, When the second buffer 104 is selected, density-corresponding data for red or cyan is output, and when the second buffer 104 is selected, density-corresponding data for the color system (white, gray, black) is output. The output density corresponding data is sent to comparison circuit 1.
Enter 06. On the other hand, a threshold circuit 127 provides a threshold value to the concession comparison circuit 106.
The color selection signal and the density regulation signal from the color selection circuit 105 are inputted to the color selection circuit 105, and a threshold value corresponding to the color gamut and density value is outputted. The comparison circuit 106 converts the stratification correspondence data into binary data (multi-value data in some cases) using a threshold value and a V density correspondence value set for each color gamut. By using this binary data as input data to a printer, copying machine, etc., it can be output and displayed externally. In addition, in a normal analog copying machine, the fluorescent markers of writing instruments are limited in their ability to be expressed, regardless of the user's will, due to integrated characteristics such as the illumination system and the sensitivity of the photoreceptor. However, within the coordinate system of the present invention, the areas where the red and cyan markers are located are known, so it is possible to erase the markers or, conversely, to output them. Here, the output value is, for example, an optical fiber tube (OFT),
An electrostatic image is written on an image forming body through a liquid crystal display (LCD), a laser, etc., especially a semiconductor laser, and is developed with a developer corresponding to the selected color signal to form a color toner image. . The above process is based on the number of color signals required, and the repetition 'i! , a multicolor toner image in which the toner images of each color are rolled is formed on the image forming member. This multicolor toner (t is usually transferred to recording paper electrically and fixed by heating or pressure, and the image forming body after transfer is transferred using a blade and/or a 7-hoo brush, etc.)
It is cleaned and prepared for the next image formation. In the above description, the optical character information obtained by optically scanning a color original is separated into red and cyan, and the obtained color 1IIr information is digitally converted and processed by a color separation means to separate red, blue, Although a black color signal is obtained and writing is performed on the image forming body using this color signal, the image forming method of the present invention is not limited to this, and any color signal other than red and blue may be used. (It may also be possible to receive multicolor signals such as green, red, cyan, magenta, yellow, etc.) As explained above, the color original 42 is read in the reading section ^ by the PIS II diagram, FIG. 12, and FIG. 14. The RO for color separation is read through the reading process shown in
Each color signal (binary or multi-valued color density data) obtained by color separation through the M table is temporarily stored in a color-specific buffer memory. A desired color signal is selected from among the color signals stored in the buffer memory by the B, mouth, and R select signals, and is output to the input section. In writing gB, a laser beam modulated by the selected color No. 18 is written to the image forming body 80 through the optical system shown in FIG. i1, and an electrostatic image is formed on the image forming body 80. . This electrostatic image is developed with a developer corresponding to the color signal to form a color toner image. This process is repeated for the required number of color signals to form a multicolor toner image in which toner images of each color are superimposed on the image forming body, which is transferred to recording paper, separated and fixed to obtain a color image. EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the embodiments of the present invention are not limited thereto. (Example 1) Using the image forming device shown in Fig. m5, a color original is read according to the reading process shown in Fig. 11, and the laser beam optical system shown in Fig. 7 is used to read a color original using the image forming device shown in Fig. m5. 1 Write on the photoreceptor drum e
An electric image was formed, and this was subjected to non-contact reversal development using a developer manufactured as described below to form a color toner image. This process is repeated three times to form a multicolor toner image consisting of blue, red, and black toner images on the photoreceptor, and this is fixed onto the recording paper via an intermediate transfer member to obtain a color image. Ta. Preparation of developer Developer consisting of blue toner: First, styrene-methyl methacrylate (1:1) mI
! 8 parts by weight of tli47 resin 7nin and 0.1 part by weight of charge control agent Paris 7 Earth Black were added to 100 parts by weight of W, mixed, mixed with a solvent, mixed, cooled, crushed and classified to obtain core particles with an average particle size of 10 μl. Obtained. For 100 parts by weight of the core particles, white conductive Ti12 (ECT manufactured by Titanium Kogyo Co., Ltd.)
-52) 3 parts by weight were mixed with stirring and adhered to the surface of the core particles, and then heat treated to fuse to the surfaces of the core particles and sphericalized to obtain blue toner particles. The volume resistivity of the toner particles at this time was 1011 Ωelf. Also red toner
and toner were obtained in the same manner as above using rhodamine B and carbon black as colorants. Next, the image forming conditions for heavy industry color image formation are shown in Table 1, Table 2, Table 3, Table 3, Table 4. Excellent blue, red, three vivid colors II! ii image was obtained. (Example 2) Image shape r&'! in FIG. Afi! In this case, an intermediate transfer roll shown in Fig. 515 is used instead of the transfer belt as the intermediate transfer body, and a magnetic brush development device shown in Fig. 3 is used as the developing device instead of the 7-arplan development device.
In addition, a color original was read according to the process shown in FIG. 14 instead of the reading process shown in FIG. A clear color image was obtained as usual. Manufacturing method of developer Developer consisting of blue toner For styrene-methacrylic 11117100 parts by weight A7
Talocyanin 8 Heavy Electrical Part, Bali 7 Earth Black 0.1
Parts by weight and 40 parts by weight of 7-Elite powder were mixed, mixed with a solvent, ground, cooled, pulverized and classified to obtain core particles with an average particle size of 1oμl. 3 parts by weight of white conductive zinc oxide was stirred and mixed with 100 parts by weight of the core particles, and the mixture was fused to the surface of the core particles and spheroidized to obtain pre-magnetic toner particles. The volume resistivity of the toner particles at this time was 10''ΩC#.Also, for the red toner and black toner, Robulin B and carbon black were used as colorants, and the same characteristics as the blue toner were prepared in the same manner as above. In FIG. 15, T is a toner image, 15o is an intermediate transfer roller, 151 is a pressure roller for transferring and fixing onto the recording paper P, and has a heat source 152. [Effects of the Invention] It is clear from the above description. As described above, according to the image forming method of the present invention and the developer used in the image forming method, it is possible to form a color image with high M image power and excellent black image reproducibility, and clear hue, and The composition of the agent, the developing device, etc. are simplified, leading to cost reduction and other effects.

[Brief explanation of drawings]

Figure 1 is a block diagram of the image forming system, Figures 2 and 3.
The figure is a sectional view of the developing device used in the present invention, tpJ4 is a sectional view of the toner image transfer VC position, FIG. 5 is a sectional view of the image forming device, and FIG. 6 is a side view of the color separation and photoelectric conversion device. ,
FIG. 7 is a cross-sectional view of the laser beam optical system, and FIG. 8 is a graph showing the spectral characteristics of the light source for optically scanning the original, the microink mirror, and the CCD sensor. 9 and 13 are color separation maps according to the present invention. FIG. 10 is a ROM table, FIG. It is a sectional view showing a fixing device. 1.80... Image forming body, 2, 23... Hopper 5... Supply roller 3... Developing roll 8
．． 26.86...Bias 20...Sleeve 21...Magnet roll 33.93...Intermediate transfer body (belt) 34.94...
・Press roll, 35.95...heat roll 37,
97... Pressure roll 42... Original 45.46
...Light source 47, 49.49'...Mirror 58...Lens reading unit/G 59...Lens 60...Prism 61...Gicroic mirror 63.65, 101.102...・C0D71...Semiconductor laser 72...Polygon mirror 73...
・Fθ lens 77...Reflector 81...Frona band? 4 units 83.84.85...Developing units 83a, 84a, 85a...Developing rolls 83b, 84
b, 85b... Supply roll 87... Cleaning device ra90... Paper feeding device 98... Paper ejecting device
100...Photoelectric conversion means 110...Amplification section
120...^/D conversion section 130... Color separation information creation means 140... Color information storage means 141.142... ROM table^... Reading section B... Writing section C.
...Image forming section D...Paper feeding section P...Transfer material (recording paper) D,,D2...Developer T...
Toner image d...Gap between image forming body and developing roll Applicant: Konishi Roku Photo Industry Co., Ltd. Figure 6/σ Figure S (a) Hikarizo Y Returning Command 1 Figure 9 VR1VC

Claims (13)

[Claims] (1) A plurality of color separation information obtained by color separation of optical information is subjected to photoelectric conversion and digital conversion, and color separation is performed based on a predetermined color separation map from the obtained plurality of digital signals, and a color signal is output. The first step is to electro-optically convert the color signal, write the obtained optical signal on an image forming body to form an electrostatic image, and develop the electrostatic image with a developer containing conductive toner as a main component. a second step of forming a color toner image corresponding to the color signal, and repeating at least the second step and rotation of the image forming body a plurality of times to form a multicolor toner image on the image forming body. A digital image forming method, which comprises forming a multicolor toner image and then transferring the multicolor toner image to a transfer material. (2) Digital image formation according to claim 1, wherein the formation of the multicolor toner image is performed by repeating the first step, the second step, and the rotation of the image forming body a plurality of times. Method. (3) The digital image forming method according to claim 1, wherein the electrostatic image is developed in a non-contact manner using a reversal development method. (4) The digital image forming method according to claim 1, wherein the multicolor toner image is transferred to the transfer material via an intermediate transfer material. (5) The digital image forming method according to claim 1, wherein the multicolor toner image is pressure-transferred onto the transfer material. (6) Photoelectrically converting and digitally converting a plurality of color separation information obtained by color-separating optical information, performing color separation based on a predetermined color separation map from the obtained plurality of digital signals, and outputting a color signal. The first step is to electro-optically convert the color signal, write the obtained optical signal on an image forming body to form an electrostatic image, and develop the electrostatic image with a developer to create a color toner corresponding to the color signal. a second step of forming an image, and after repeating at least the second step and rotation of the image forming body a plurality of times to form a multicolor toner image on the image forming body, the multicolor toner image is formed on the image forming body; A developer for digital image formation, wherein the developer used in an image forming method for transferring a toner image onto a transfer material contains a conductive toner as a main component. (7) The digital image forming device according to claim 6, wherein the formation of the multicolor toner image is performed by repeating the first step, the second step, and the rotation of the image forming body a plurality of times. developer. (8) The digital image forming developer according to claim 6, wherein the development with the developer containing the conductive toner as a main component is performed in a non-contact reversal development method. (9) The developer for digital image formation according to claim 6, wherein the developer contains a non-magnetic conductive toner as a main component. (10) The developer for digital image formation according to claim 6, wherein the developer contains a magnetic conductive toner as a main component. (11) The digital image forming developer according to claim 6, wherein the multicolor toner image is transferred to the transfer material via an intermediate transfer material. (12) The developer for digital image formation according to claim 6, wherein the multicolor toner image is transferred to the transfer material by pressure. (13) The developer for digital image formation according to claim 9 or 10, wherein the conductive toner is a capsule toner.