JPS59185358A - Copying method and photosensitive screen to be used for execution of said method - Google Patents

Abstract

PURPOSE:To simplify the production method of a photosensitive screen and to increase the stability of the production by forming a conductive screen having many openings and exposed at a part of one side and an insulating layer formed on the other side of the conductive screen. CONSTITUTION:The photosensitive screen 17 has many fine openings 10 and consists of the conductive screen 11 exposed at one side and a photoconductive layer 12 formed at least on the other side of the conductive screen 11. Since the photosensitive screen used in the invention is exposed at one side and laminates the insulating layer and the photoconductive layer on the other side, the screen can be easily produced like an endless screen, so that the production method is simplified as compared to the ordinary method and the stability of the production can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Industrial Field of Application The present invention is applicable to a large number of openings (particularly fine mesh-like openings).
An electrostatic charge image is formed on a photosensitive screen having an electrostatic charge image, and the passage of a stream of charged particles (e.g., positive ion particles) is controlled by the electrostatic charge image to a chargeable layer (e.g., the photosensitive layer of a photoreceptor drum). The present invention relates to a copying method (particularly an electrophotographic copying method) for forming a predetermined electrostatic charge image and a photosensitive screen used to carry out the method.

2. Prior art As for the above-mentioned photosensitive screen, for example,
As described in Japanese Patent No. 4-31376, an NP screen photoreceptor is known in which a photoconductive layer and an insulating layer are sequentially laminated on a screen substrate.

In the electrophotographic process using this NP screen photoreceptor, for example, as shown in Japanese Patent Publication No. 54-2714.4, the screen photoreceptor is subjected to primary charging and then secondary charging (alternating current or direct current). The process consists of simultaneous image exposure and then full-surface exposure in sequence. However, in such screen photoreceptors and their processes, heat-resistant amorphous Se is used as the photoconductive layer of the photoreceptor.
When a photoconductive layer is used, crystallization of the photoconductive layer tends to occur when an insulating layer formed thereon is dried. For this reason, the selection range of the insulating layer material to be used becomes narrow. Furthermore, when the photoconductive layer is made of an organic optical semiconductor (OPC), due to its poor carrier transport ability, sufficient sensitivity cannot be obtained in a process in which exposure is performed simultaneously with charging.

Further, in Japanese Patent Publication No. 53-1.38734, as shown in FIG. A screen photoreceptor 7 with a bias layer is shown.
However, in this screen photoreceptor, since the photoconductive layer 2 and the insulating layer 3 are provided on both sides of the substrate 1, it is difficult to create an endless drum-shaped screen.
Moreover, since there is a strong possibility that the bias layer 4 will come into contact with the substrate 1 during its formation and become electrically conductive, it will be impossible to apply a bias.

On the other hand, in order to reproduce originals in which black and multiple chromatic colors coexist using electrophotography or electrostatic printing, an electrostatic charge image corresponding only to the image area of a certain color is formed, and this is The image was developed using a developer2, and this process was performed for each color. By such a method, it is possible to reproduce an image of a document consisting of a combination of various colors. In this case, an electrostatic charge image corresponding to the light from each image area is formed on an image support such as a photoreceptor drum, and this is developed with a developer mixed with toner and, if necessary, carrier. Images are formed based on a process in which a toner image is electrostatically transferred onto a transfer sheet and further fixed.

As such a multicolor copying method, a method using an NP/6 light body is known. For example, Tokuko Sho 48-347
According to Publication No. 70, the photoreceptor is imagewise exposed through a red light filter and at the same time positively charged, and then imaged through a cyan filter and at the same time negatively or AC charged to form an electrostatic latent image for red only. After red color development and transfer, an electrostatic latent image for black color is formed using a conventional method, and this is developed and transferred to black color. Furthermore, according to Japanese Patent Publication No. 55-33066, the entire surface is exposed to a positive charge, and then the image is exposed through a cyan filter, and at the same time a negative or AC charge is applied, and then the image is exposed to a red filter to generate red and black electrostatic charges. Latent images are formed with mutually opposite polarities, and each latent image is developed with toner of mutually opposite polarities and transferred to obtain a two-color image.

However, in the method using the above NP photoreceptor,
In the process, it is necessary to perform image exposure at the same time as charging, but since the conditions of the photoconductor are different between exposed and non-exposed areas, it is difficult to control the charging so that charging is performed under the same conditions. It's not easy. Furthermore, since image exposure and charging must be performed simultaneously, it is relatively difficult to maintain a sufficient charging potential. In the process using an NP photoreceptor, it is difficult to erase black images (especially thin lines) when image exposure is performed twice, and black and red images are difficult to erase when image exposure is performed only once. It is difficult to secure sufficient potential for both. Unfortunately, when using a photoreceptor with a long carrier transit time (for example, an organic optical semiconductor), sensitivity tends to decrease.

On the other hand, as another multicolor copying method,
There is a method of using a composite photoreceptor having an f* layer consisting of a photosensitive layer insensitive to red light and a photosensitive layer sensitive to at least red light, as shown in Japanese Patent Application No. According to this,
Primary charging is performed while uniformly exposing only the upper photosensitive layer to show photoconductivity, then secondary charging with opposite polarity is performed in a dark place, and further image exposure is performed to form a white image area. The charge of the photosensitive layer, which is highly sensitive to red light, remains only in the area corresponding to the red image area, and the polarity of the surface potential thereof is reversed to that of the black area.

However, with this known method, the layer structure of the photoreceptor is complicated and it is difficult to prepare, and the potential stability during repeated use is poor due to the influence of the residual potential of each photosensitive layer. turn into.

3. Purpose of the Invention The purpose of the present invention is to use a photosensitive screen that has a simple manufacturing method, excellent manufacturing stability, high surface smoothness, high surface strength, high charge retention ability, and low photosensitivity. It is an object of the present invention to provide a copying method that can reproduce a multicolor image clearly and obtain a stable image even when used repeatedly, and a photosensitive screen thereof.

4. Structure of the Invention That is, the present invention provides the copying method described at the beginning, which includes (a) a conductive screen having a large number of openings and at least a portion of one surface thereof being exposed; (b); an insulating layer provided on at least the other surface of the conductive screen (which may also extend to the wall surface within the opening); Lamination of an 8rr2 carrier generation layer as the top layer that is sensitive to some light and transmits other light, and a first carrier generation layer as the bottom layer that absorbs the light that passes through the abrasion generation layer. a first charging step in which the photosensitive screen is charged using a screen comprising a photoconductive layer; and simultaneously with this first charging step; or before and/or after, primarily the second charging step; An exposure step (I!/lJ, for example, 2
, a whole surface exposure step using partially chromatic light); a second charging step of charging the second carrier generation layer to a polarity opposite to the first charging step; simultaneous with or before the second charging step; / or later, an image exposure step (e.g., selectively imagewise exposing the photosensitive screen with light transmitted through the second carrier generation layer and mainly absorbed by the first carrier generation layer) (e.g., using light other than the chromatic light). The invention relates to a copying method characterized by comprising an image exposure step using chromatic light.

When this copying method is applied to forming a multicolor image, a copying method that uses an original having a black image area and a color image area (for example, a red image area) and obtains an image corresponding to at least the color image area. (a) forming a first electrostatic charge image on the electrostatic charge image support in an area corresponding to the black image area and the color image area; (b) forming a first electrostatic charge image on the electrostatic charge image support in the area corresponding to the black image area and the color image area; forming a second electrostatic charge image having an electrostatic charge of the same polarity as the first electrostatic charge image only in a corresponding region; (C) placing the photosensitive screen opposite to the electrostatic charge image support; In the state
A stream of charged particles having a polarity opposite to that of the first electrostatic image is projected onto the electrostatic image support through the photosensitive screen IJ, thereby causing the first electrostatic image corresponding to the pre-black image area to be projected onto the electrostatic image support. It is desirable to apply a copying method that includes a step of erasing only the charge image.

The present invention also provides a photosensitive screen used in carrying out the above-mentioned copying method, which is configured to form an electrostatic charge image for controlling the passage of a charged particle stream, and which is configured to form an electrostatic charge image that controls the passage of a charged particle stream. a conductive screen that forms a predetermined electrostatic charge image on a chargeable layer by the action of a particle flow; (b) an insulating layer provided on at least the other surface of the conductive screen; and (C) this insulating layer. an uppermost second carrier generation layer that is provided above and is sensitive to at least a part of light in the visible light region and transmits other light; a charge transport layer below the second carrier generation layer; a photoconductive layer that is present under the charge transport layer and is a laminate including a first carrier generation layer as the lowest layer that absorbs at least light transmitted through the second carrier generation layer; It also provides a sex screen.

5. Examples Hereinafter, the present invention will be explained in detail using examples with reference to the drawings.

First, an example of the photosensitive screen used in the present invention is
Description of the Figures 0 This photosensitive screen 17 includes a conductive screen 11 that has a large number of fine openings 10 and has one side exposed, and is provided on at least the other side of this conductive screen (example shown in the figure). (It is also provided on the wall inside opening 10)
an insulating layer 13 and a photoconductive layer 1 provided on this insulating layer
2. The photoconductive layer 12 includes a second carrier generation layer 12b that is sensitive to some chromatic light in the visible light region and transmits other chromatic light, a charge (carrier) transport layer 8, and at least a 2 carrier generation layer 1
The first carrier generation layer 12a is sensitive to the chromatic light transmitted through the first carrier generation layer 12b. The second carrier generation layer 12b and the first gear generation layer 12a only need to have substantially different main photosensitive wavelength ranges, and do not need to have completely different photosensitive wavelength ranges.

The conductive screen 11 may be made of metal such as stainless steel, Ni, At, or the like.

The constituent materials of the insulating layer 13 include polyethylene, polypropylene, acrylic resin, methacrylic resin, vinyl chloride resin, vinyl acetate resin, epoxy resin, polyurethane resin, phenol 4Qt resin, polyester resin,
Addition polymerization type resins, polyaddition type resins, polycondensation type resins such as alkyd resins, polycarbonate resins, silicone resins, melamine resins, polyester resins, and copolymers containing two or more of the repeating units of these resins. Resins (for example, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate-maleic anhydride copolymer resin), etc. can all be mentioned. However, the resins that can be used here are not limited to these, and all resins commonly used for such purposes can be used, or insulating materials other than resins can also be used.

The first carrier generation layer 12a constituting the photoconductive layer 12 is made of an azo dye such as a monoazo dye, a perylene dye such as perylene acid anhydride, a polycyclic quinone dye such as an anthrone derivative, or a phthalocyanine such as metal phthalocyanine. Organic dyes such as system dyes; amorphous As-8eXSe-Te alloy,
It may be made of an inorganic semiconductor such as amorphous silicon.
Further, the second carrier generation layer 12b can be made of amorphous Se or the above-mentioned organic dye. Note that the binder resin that can be used for this photoconductive layer may be the same as that used for the above-mentioned insulating layer.

The carrier transporting layer 8 is composed of carrier transporting substances that have high mobility for specific or non-specific polar carriers, which are generally classified into electron-donating substances and electron-accepting substances, and include many organic Appropriately selected from the group of compounds. Examples of the electron-donating substances used include fused polycyclic compounds such as anthracene and its derivatives, phenanthrene and its derivatives; diphenylamine, thiazole derivative 4; 4-C4'-dimethylaminophenyl-5-phenyl-imidazole; Screw (4-N, N-
Aromatic amine compounds such as diethylamino-2-methylphenyl)-phenylmethane; acylhydrazone derivatives;
Examples include oxazole derivatives such as 2-[4'-dimethylaminophenyl-5-phenyl-oxazole. Examples of electron-accepting substances include succinic anhydride, maleic anhydride, dibromaleic anhydride, phthalic anhydride, tetrachlorophthalic anhydride, tetrabromophthalic anhydride, 3-nitrophthalic anhydride, and 4-nitrophthalic anhydride. Acid, pyromellitic anhydride, mellitic anhydride, tetracyanoethylene, tetracyanoquinodimethane, o-dinitrobenzene, m-dinitrobenzene, 1,3,5-
Trinitrobenzene, paranitrobenzonitrile, picric acid, 0-nitrobenzoic acid, p-nitrobenzoic acid, 3
, 5-dinitrobenzoic acid, pentafluorobenzoic acid, 5
-Nitrosalicylic acid, 3,5-dinitrosalicylic acid, phthalic acid, mellitic acid, and other compounds with high electron affinity can be mentioned.

The carrier transport layer can be formed by selecting one or more of the above-mentioned carrier transport materials, but in order to exhibit sufficient film-forming ability, it is necessary to use a resin with high compatibility. It is preferable that the carrier be incorporated therein to form a carrier transport layer.

One method for creating the photosensitive screen 17 is to first prepare a solution for forming an insulating layer having the following composition: Acrylic resin (Dyanal HR-116: manufactured by Mitsubishi Rayon Co., Ltd.) Melamine resin (Super Beckamine J-820) : Dainippon Ink Chemical Industry Co., Ltd.) 21 Toluene
107 Methyl isobutyl ketone 30m Cellsolve acetate 60ml1 This solution was applied to one side of a 100 lines/inch stainless steel screen base (conductive screen) using a spray gun, and 12
Dry at 0°C for 1 hour to form an insulating layer with a maximum thickness of about 10 μm.

Next, a dispersion liquid for forming the first carrier generation layer 12a having the following composition is prepared.

β-type copper phthalocyanine (C, 1,74160) 05 Tapolycarbonate resin (Panlite L-1250 = manufactured by Teijin Kasei Co., Ltd.) o, 5r 1.2-Dichloroethane 50d Toluene 50ml1 This composition was dispersed in a ball mill over 48 hours. After that, apply it on the above insulating layer with a spray gun and rotate it at 80°.
The mixture is dried at C for 1 hour to form a first carrier generation layer having a thickness of about 1 μm.

Next, a solution for forming a carrier transport layer having the following composition is prepared.

Bis(4-N,N-diethylamino-2-methylphenyl)-phenylmethane 3.75 f Polycarbonate resin (Panlite L-1250: manufactured by Yotaikasei Co., Ltd.) 57 1,1,2-tricooethane 100 mA This solution was applied onto the first carrier generation layer to a thickness of 7 μm using a spray gun to form a carrier transport layer.

Furthermore, 4,10-dibromoanthanthrone (C, 1,59300) was deposited on this carrier transport layer to a thickness of 0.2 μm by vacuum evaporation to form a second carrier generation layer.

A copying process using the photosensitive screen thus prepared will be schematically explained with reference to FIG.

FIG. 3A is an enlarged view of the main parts of the photosensitive screen shown in FIG. It shows. However, the screen 17 is shown upside down compared to FIG.

Hereinafter, from FIG. 3B onward, for ease of understanding, the first and second carrier generation layers, the carrier transport layer, the screen 1
The cross-sectional sowing of each layer of No. 7 is omitted from the illustration.

In the copying process, first, as shown in FIG. 3B, the entire surface of the photoconductive layer 12 of the screen 17 is charged with a DC corona discharge of, for example, +6 KV to raise the screen surface potential to 5.
Uniformly and positively charged to 50V.

Next, as shown in FIG. 3C, the entire surface is exposed to partially chromatic light 14 mainly absorbed by the second carrier generation layer (exposure by an EL panel with an emission peak wavelength of 460 nm).

As a result, among the carriers generated in the photoconductive layer 12, electrons neutralize the positive charges on the surface, and holes are generated in the insulating layer 12.
Accumulated on one side of 3.

This process reduces the screen surface potential to -330
It becomes v.

Next, as shown in FIG. 3D, the surface of the photoconductive layer 12 is uniformly negatively charged to a screen surface potential of -80 V using a charger, for example, by direct current corona discharge of -5.5 KV.

Next, as shown in FIG. 3E, the photoconductive layer 12 is selectively irradiated with reflected light 15 (for example, chromatic light corresponding to the red image area and furthermore, the white area) from the positive original to be copied. As a result, the light is mainly absorbed by the first carrier generation layer, the photoconductive layer 12 in the exposed area becomes non-conductive, the surface charge in the same area decreases or disappears depending on the amount of exposure, and the insulating layer The positive charge accumulated on one side remains, and the surface potential becomes +220■. On the other hand, in non-exposed areas (for example, areas corresponding to black image areas), surface negative charges remain as they are, and a charge pattern corresponding to the original is formed.

Next, as shown in FIG. 3F, the chargeable layer (image-receiving material) 18 on the conductive substrate 16 is made to face the photoconductive layer 12 side of the photosensitive screen 17, and the distance between the screen and the image-receiving material is, for example, 2. An ion supply source and a charger 19 are arranged on the exposed surface side of the conductive screen 1, and the distance between the discharge wire and the screen is set to, for example, 12 degrees. Then, while a predetermined voltage (for example, 1.2 KV) is applied from the power source E between the conductive substrate (electrode plate) 16 and the conductive screen 1, positive ions 20 are supplied from the charger 19 with a DC current of, for example, +9 KV. Projected with corona discharge. As a result,
The positive ions 20 are attracted by the electric field in the negatively charged area of the surface of the photoconductive layer 12, pass only through the fine apertures 10 in the same area, reach the regenerative electric layer 18, and are deposited there. A positive electrostatic charge image 21 is formed. This electrostatic charge image 21 is formed in a pattern that exactly corresponds to the non-exposed area of FIG. 3E. On the other hand, in the exposed region where negative charges are insufficient or have disappeared on the photoconductive layer 12, the positive ions 20 are repelled and do not reach the regenerative electric layer 18.

The electrostatic charge image 21 thus formed is then developed with a toner n of negative polarity as shown in FIG. 3G, so that a positive visible image can be obtained on the regenerative electric layer 18. Alternatively, a bias voltage is applied to the electrode plate 16 so that a negative voltage is applied to the regenerative electric layer 18, thereby neutralizing the positive charge 21 in FIG. 3F as shown in FIG. 4A, and eliminating the positive charge 21. By generating negative charges 21' in a predetermined pattern in the area and developing them with positive polarity toner, a negative image 23 as shown in FIG. 4B can be obtained.

The resulting toner image can then be transferred and further fixed onto copy paper using known techniques.

FIG. 5 shows an example in which the photosensitive screen 17 is applied to copying a multicolor image. In the following, for the sake of simplicity, two screens having a black image area and a red image area on a white background will be described. Image reproduction of color originals will be explained.

FIG. 5 shows an example of an electrophotographic copying apparatus for forming a two-color copy image according to the present invention.

A reciprocating document table 41 is provided at the top of the main body of the apparatus, and the document 25 placed on the document table 41 is illuminated by an illumination lamp 42 . 43, weak is mirror,
45 is a fixed lens, 46 is a movable red filter configured to be able to enter and exit the optical path, and 47 is a movable dichroic filter that reflects red light and passes cyan, which is a complementary color to red. The structure is such that it can be moved in and out of the optical path. FIG. 5 shows a state in which the red filter 46 is removed from the optical path and the dichroic filter 47 is placed in the optical path.
A photosensitive layer 18 is provided on the surface of a drum-shaped photosensitive member 53, and when the photosensitive member 53 rotates clockwise, the photosensitive layer 18 is uniformly charged by a corona charger U. Photosensitive layer 1
8 is made of selenium or an organic semiconductor. Around the photoreceptor 530, there is a charger that uniformly charges the photoreceptor 18, a black developer 48 containing positively charged black toner, and a positive A red developing device 49 containing charged red toner and a cleaning device 30 for removing toner and charges remaining on the photosensitive layer 18 are disposed. A transfer drum 31 has the same diameter as the photoreceptor 53 and is driven in contact with the photosensitive layer 18 or rotates counterclockwise. 63 is a transfer electrode consisting of a corona discharger; 32 is a copy paper feed tray; 33 is a paper feed roller that feeds the copy paper 52 stored in the copy paper feed tray 32 one by one; 34 is a paper feed roller that feeds the copy paper 52 one by one; A first conveyance roller conveys the copy paper to the transfer drum 31; 35 is an electrostatic separator that eliminates static electricity to make it easier to separate the copy paper from the drum 31 after transfer; and 36 is a separation claw that forcibly separates the copy paper from the drum 31. I'll go. Further, 37 is a fixing device 1i with a built-in heater. However, copy paper 52 is used for actual deduction.
Although a guide plate is provided for guiding, this illustration is omitted.

On the other hand, a cylindrical photosensitive screen drum 17 is disposed outside the photosensitive layer 18 so that the photoconductive layer faces.
This drum 17 is arranged so that it can rotate counterclockwise in synchronization with the document table 41 and the photosensitive layer 18. Further, around the outside of the drum 17, a screen charger 28 and an EL (electroluminescence) plate or A
, Screen static eliminator made from C corona static eliminator etc. 39
and a charged particle source (corona discharger) 19 that projects charged particles to a position facing the photoreceptor 53 inside the photosensitive screen drum 17.

Next, a two-color image copying process using this copying apparatus will be explained with reference to FIGS. 6 to 10.

That is, as shown in FIG. 6A, an electrostatic image support (photoreceptor) 53 is provided with a photosensitive layer 18, which is a photoconductive material layer made of selenium-tellurium, on a conductive support 1G. The photosensitive layer 18 is irradiated with an optical image of the document portion having a negative color image portion R of the body 16 and the corona charger via a cyan color filter 47 which is a complementary color to red. The cyan filter used here is an optical means that transmits only cyan light. As a result, light is irradiated to areas other than the areas corresponding to the black image area B and red image area R on the nine-layer 18, and the static charge disappears. 1 electrostatic charge image is formed.

The arrow indicates the irradiation of the light 50.

On the other hand, for the photosensitive screen drum 17, the 6th B
The following processing is performed before the process shown in the figure.

That is, as shown in Figure 7A (corresponding to Figure 3A above).
□As shown in Fig. 7B, the photosensitive screen drum 17 is uniformly positively charged to a screen surface potential of 550 cm using a charger 28 (see Fig. 5), for example, by direct current corona discharge. As shown in FIG. 7c, the entire surface is partially irradiated with chromatic light 14. This process results in a screen surface potential of +300V.

Thereafter, as shown in FIG. 7D, the entire surface is negatively charged to -5 OV using a charger, for example, by direct current corona discharge.

Then, at the same time as the step shown in FIG. 6B, the reflected light 15 from the cyan filter 47 (that is, the light corresponding to the red image area R and the white area W) is irradiated onto the corresponding area on the screen, and the 7E As shown in the figure, the original negative charge is left only in the non-exposed area.

Next, as shown in FIG. 7F, when positive ions 2o are projected in the same arrangement as described in FIG. Then, the ions 2o pass through and reach the photosensitive layer 18, selectively neutralizing only the negative charges thereon (formed in the step of FIG. 6B) and causing them to disappear. As a result, negative charges in areas where the ions 2o do not reach remain in a predetermined pattern on the photoreceptor, and a negative electrostatic latent image 54 corresponding to the red image area R is formed as shown in FIG. 7G.

In this way, an electrostatic charge image is formed in which the black image area is erased and has negative electrostatic charges only in the area corresponding to the red image area R of the photosensitive layer 18. To develop this electrostatic charge image with red toner, a photoreceptor 53 is used as shown in FIG.
A red reproduction portion RT is formed.

Next, in order to reproduce the black image portion B of the document 25, a separate step of forming the black image portion may be performed.

That is, as shown in FIG. 9A, the photosensitive layer 18 of the photoreceptor 53 is uniformly negatively charged by the corona charger 24, and then, as shown in FIG. 9B, the optical image of the original 25 is colored red. The photosensitive layer 18 is irradiated through the filter 46 to form an electrostatic charge image having a negative electrostatic charge only in the area corresponding to the black image area B of the document 25, and this is developed with black toner to form a black image. Forming the reproduction section BT (see FIG. 9C) 0 In this way, a two-color copy image corresponding to the original 25 having the black image section B and the red image section R can be formed as shown in FIG. 10. The process includes a step of forming only the red reproduction portion RT explained with reference to FIGS. 6 to 8;
It will be understood that this process may be combined with the process of forming the black reproduction portion BT exemplarily explained with reference to FIG.

Although the present invention and its modifications have been illustrated above, the above-mentioned examples can be further modified based on the technical idea of the present invention.

For example, the charging polarity of the above-mentioned photosensitive screen and recharging layer, the polarity and type of the developing toner, etc. can be changed as appropriate. In addition, the above-mentioned full-surface exposure and image exposure steps are
It may be performed simultaneously with or before each charging step. Further, the order of the color image forming step and the black image forming step can be reversed.

Note that the present invention is applicable not only to the above-mentioned one-color or two-color image formation, but also to the formation of two or more color images made of other colors or combinations thereof.

6 Effects of the Invention As described above, the present invention is a photosensitive screen in which an insulating layer is formed on a conductive screen by a spray coating method or a vapor deposition method, and on this insulating layer is formed a first and second carrier generating layer having different light absorption wavelengths. Since the photoconductive layer is made of a laminate of a carrier transport layer and a carrier transport layer as an intermediate layer between these layers, the photoconductive layer can be damaged by heating during drying of the insulating layer or by radiant heat during vapor deposition. Alterations such as crystallization can be prevented, and the selection range of insulating layer materials can be expanded. Moreover,
Since the copying process does not require exposure to light at the same time as charging, the normal Carlson process can be applied even if a photoconductive layer such as OPC with low carrier transport ability is used, making it possible to achieve good sensitivity. can.

In addition, since the photosensitive screen used in the present invention has one side exposed and an insulating layer and a photoconductive layer laminated on the other side, it is easy to make it in an endless form, and the insulating layer Since there is no bias conductive layer on top, there is no problem of electrical conduction with the screen substrate.

Furthermore, since the copying method of the present invention does not require charging and exposure at the same time, it is relatively easy to control the potential, making it easy to obtain a predetermined potential, making the photoconductive layer highly sensitive, and making the photoconductive layer The layer is less affected by residual potential and potential changes due to fatigue of the photoreceptor, and furthermore, it can be used by applying known processes, making it highly practical.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged sectional view of a conventional photosensitive screen. 2 to 10 show examples of implementation of the present invention, in which FIG. 2 is a partially enlarged cross-sectional view of a photosensitive screen, FIG. 3A, FIG. 3B, FIG. 3C, FIG. 3D, Figures 3E, 3F, and 3G are cross-sectional views showing each stage of the copying process. Figures 4A and 4B are cross-sectional views showing other developing methods. Figure 5 is two-color image formation. Schematic cross-sectional view of an electrophotographic copying machine for
Figures 7D, 7E, 7F, 7G, 8, 9A, 9B, 9C, and 10 are cross-sectional views showing each step of the two-color copying process. be. In addition, in the symbols shown in the drawings, 1.11...... Conductive screen 2.12... Photoconductive layer 3 .1
3・・・・・・・・・・Insulating layer 4・・・・・・・・・
...... Conductive layer for bias 7.17...
・・・・・・・・・Photosensitive screen 8・・・・・・
......Carrier transport layer 12a.
.........First carrier generation layer 12b... Second carrier generation layer 18...・・・・・・・・・・・・・・・
・・・・・・Recharging layer 19.24.28・・・Charging device surrounding・・・・・・・・・・・・・・・・・・Positive ions 21.21 '・・・・・・・・・・・・・Electrostatic charge image 22.23・・・・・・・・・・・・・Toner image 25・・・・・・・・・・・・・・・・・・・・・・・・
Manuscript 31・・・・・・・・・・・・・・・・・・
Transfer drum 37・・・・・・・・・・・・・・・・・・
・・・Fuser 42・・・・・・・・・・・・・・・・・・
・・Light source 46 ・・・・・・・・・・・・Red filter 47 ・・・・・・・・・・・・・・・・・・・・・
Dichroic ink filter (cyan color filter) 48.49・・・・・・・・・・・・Developer for each color 52・・・・・・・・・・・・・・・・Copy paper 53
・・・・・・・・・・・・・・・Photosensitive drum R
・・・・・・・・・・・・・・・ Red image part B...
・・・・・・・・・・・・Black image part W・・・・・・
・・・・・・・・・・・・White part RT・・・・・・・・・
・・・・・・Red image BT・・・・・・・・・・・・・・・
・The image is black. Agent Patent Attorney Hiroshi Aisaka (and 1 other person) Figure 3 DI Figure 3 El Seki 3 FI Separate 7 → Saratoshi'φ;: '-7゜0001 Waroyo〉 No. 810 Figure 9A Figure 9B Figure 9G1 Row 10 Seki

Claims (1)

[Claims] 1. An electrostatic charge image is formed on a photosensitive screen having a large number of openings, and the passage of a charged particle flow is controlled by this electrostatic charge image to form a predetermined electrostatic charge image on a chargeable layer. In the copying method, the photosensitive screen includes: (a) a conductive screen having a large number of openings and at least a portion of one surface thereof being exposed; and (b) at least one of the conductive screens. an insulating layer provided on the other surface; (C) a second uppermost layer provided on the insulating layer and sensitive to at least part of the visible light range and transparent to other light; a carrier generation layer, a charge transport layer under the second gear generation layer, and a first carrier generation layer at the bottom layer that is present under the charge transport layer and absorbs at least the light that passes through the second carrier generation layer. A first charging step of charging this photosensitive screen using a screen consisting of a photoconductive layer made of a laminate; At the same time as this first charging step, or before and/or after that, mainly the second carrier is charged. an exposure step in which the entire surface of the photosensitive screen is exposed to light having a wavelength that is absorbed by the generation layer; a second charging step in which the second carrier generation layer is charged to a polarity opposite to the first charge; the second charging step At the same time as the step or before and/or after the step, an image exposure step of selectively exposing the photosensitive screen to light that passes through the second carrier generation layer and is mainly absorbed by the first carrier generation layer. A copying method comprising: 2. A copying method for obtaining an image corresponding to at least the color image portion using a document having a black image portion and a color image portion, the copying method comprising: (a) an area corresponding to the black image portion and the color image portion; (b) forming an electrostatic charge of the same polarity as the first electrostatic charge image only in an area corresponding to the black image area of the photosensitive screen; (C) with the photosensitive screen facing the electrostatic image support;
A stream of charged particles having a polarity opposite to that of the first electrostatic charge image is projected onto the electrostatic charge image support via the photosensitive screen, whereby only the first electrostatic charge image corresponding to the black image area is formed. The method according to claim 1, comprising the step of causing the to disappear. 3. Constructed so that an electrostatic charge image is formed to control the passage of the charged particle flow, and a predetermined electrostatic charge image is formed on the chargeable layer by the action of the charged particle flow controlled by this electrostatic charge image. (b) an insulating layer provided on at least the other side of the conductive screen; (C) a photosensitive conductive screen provided on the insulating layer and used to emit light in the visible light range; a second carrier generation layer on the uppermost layer that is sensitive to light and transmits other light; a charge transport layer under this second carrier generation layer; 2. A photosensitive screen comprising a photoconductive layer formed of a laminate with a first carrier generation layer as the lowest layer that absorbs light transmitted through the carrier generation layer.