JPS6299767A - Electrophotographic copying method - Google Patents

Abstract

PURPOSE:To prepare a composite copy from plural originals by sticking electrostatically charged photosensitive toner, forming a charged toner image by making image exposure by the first original, and sticking the second charged photosensitive toner to the part excluding the charged toner image. CONSTITUTION:Photo-conductive toner 2 electrostatically charged to the charge having fixed polarity is applied uniformly on the surface of a conductive base body 1 and image exposure is made to form an electrostatic latent image 4 on a photoconductive toner layer. Then, the second photoconductive toner 5 is applied on the first photoconductive toner layer of the base body 1 by using similarly charged second photoconductive toner 5. The second original 7 is superposed on the first original 3, and the coated layers of the first and the second photoconductive toner are image exposed. The charged image of the first charged photosensitive toner corresponding to the first original 3 and a charged image 8 of the second photosensitive toner corresponding to the second original 7 are formed on the surface of the base body 1. The image 4 of charged first photosensitive toner and the charged image 8 out of the second photosensitive toner are transferred on the surface of a transferring medium 9, and thus, a composite copy is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL FIELD The present invention relates to an electrophotographic method for producing composite copies from a plurality of original documents, and more particularly to a method for producing composite copies from a plurality of original documents, and more particularly to a method for producing composite copies from a plurality of original documents. and how to make composite copies using the present invention.

To obtain a single copy from multiple materials from different prior art sources,
After taking out copies of multiple different types of materials, a manuscript for copying must be prepared in advance.

Traditionally, image composition (editing)! Copying machines with eight functions are also known, but such copiers are considerably more expensive due to their intelligent features, ie, image processing capabilities.

The object of the invention is to provide a copying method that allows a composite copy to be easily created from multiple originals even with an ordinary copying machine that does not have a special image processing section. shall be.

Another object of the present invention is to perform the necessary one-step process of synthesizing images in advance.
．． Another object of the present invention is to provide an electrophotographic copying method in which a plurality of types of images are combined during a copying operation.

Still another object of the present invention is to provide an electronic copying method capable of displaying composite images in different colors. (photoconductive toner), it has been found that a composite copy can be easily created from a plurality of original documents by the multi-stage image one-light processing described below.

According to the present invention, a charged photosensitive toner is uniformly adhered onto a conductive substrate, image exposure is performed using a first original to form a charged toner image corresponding to the first original, and the charged toner image is formed on a conductive substrate. A second charged photosensitive toner is attached to the area excluding the toner image, and image exposure is performed with the second original superimposed on the first original to correspond to the first original and the second original. An electrophotographic method for making a composite copy from a plurality of original documents is provided, comprising forming a charged toner image on a substrate and transferring the charged toner image on a substrate to a transfer medium.

Operation In FIG. 1 for explaining the principle of the method of the present invention, on the surface of the conductive substrate 1, there is a -total polarity charge (negative charge).
The photoconductive toner 2 electrically charged is uniformly applied (first stage coating step (A)). Next, image exposure is performed through the first source [3, and the charge of the toner disappears in the bright area L1. Then, in the dark area D1, the charge of the toner is left to form an electrostatic temperature compensation 4 on one layer of photoconductive toner (first stage image exposure step (B)). A second photoconductive toner 5 is applied onto one layer of the photoconductive toner of the substrate 1 using a photoconductive toner 5 of 100 to 1000 nm. In this case, there is a homopolar repulsion effect, and the second photoconductive toner 5 is selectively applied only on the first photoconductive toner 6 that has been neutralized f' (second-stage coating process (C)).
)).

The second original 7 is superimposed on the first original 7, and in this state, the coated layers of the first and second photoconductive toners are imagewise exposed.

In the dark area DI of the first original 3, the charged image 4 of the first photoconductive toner remains as it is, and in the dark area D2 of the second original 7, the charged image 4 of the first photoconductive toner remains unchanged. The charged charge of the photoconductive toner 5 remains as it is, becoming a one-charge image 8, and in the bright area L2 of the second document 7, a second band of photoconductive toner 5!
The charge is dissipated due to the photoconductivity of the first and second toners (second stage light step (1)).

Through the above steps, the charged image 4 of the first photosensitive toner corresponding to the first document B is formed on the surface of the substrate 1, and the charged image 4 of the second photosensitive toner corresponding to the second document 7 is formed on the surface of the substrate 1. A charged image 8 is formed.

The transfer medium 9 is superimposed on the substrate having these toner images h5 and, for example, a band t having a polarity opposite to that of the photosensitive toner is applied from the back side of the transfer medium 9 by a corona charger 10 (transfer step (E)). ○As a result, the charged image 4 of the first photosensitive toner and the internally charged image 8 of the first photosensitive toner are electrostatically transferred onto the surface of the transfer medium 9.
A composite copy is obtained by subjecting this transfer to a fixing means known per se.

According to the present invention, as explained above, the first stage coating/exposure process using the first photosensitive toner and the second stage coating/exposure process using the second photosensitive toner are combined, and finally, It will be understood that by electrostatically transferring the charged images of both toners onto a transfer medium, image composition and editing from a plurality of original documents can be easily performed within the copying process. By using the first photosensitive toner and the second photosensitive toner with different hues, it is possible to obtain a composite copy in which the images are printed in color, which is a significant advantage of the present invention. be.

DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION In the present invention, the conductive substrate is, for example, a metal drum made of aluminum Uno 2, aluminum foil, copper, etc., a plastic film substrate such as biaxially stretched polyester film with aluminum foil laminated to it, or a metal drum. Any conductive substrate can be used, such as an Al-deposited composite or conductive glass (A'ESA glass).

The photoconductive r+ toner includes a photoconductive pigment such as zinc oxide, 6°dS, etc. inorganic photoconductive pigment in an electrically insulating resin fixing medium.
Powders made of compositions in which photoconductive organic pigments such as vilanthrone pigments, phthalo/aniline pigments, disazo pigments, and trisazo pigments are dispersed are used. The photoconductive pigment is preferably used in an amount of from 5 to 50 parts by weight, especially from 5 to 30 parts by weight, per 100 parts by weight of fixing medium. When the content of the photoconductive pigment is less than the above range, image density and toner sensitivity tend to decrease, and when it exceeds the above range, charge retention tends to decrease.

As the fixing medium, electrically insulating fixing resins known per se, such as polystyrene, styrene-acrylic copolymer, acrylic resin, polycarbonate, boria 1 root (polyester of bisphenol A and iso- or terephthalic acid), Polyvinyl butyral, polysulfone can be used, and photoconductive resins such as polyvinyl carbazole, alone or in combination with electrically insulating resins, are also useful for the purposes of this invention.

In a preferred photosensitive toner, a charge transport medium is used in conjunction with the fixing medium, in which the photoconductive pigment described above is dispersed with a charge generating pigment, and the dispersion is made into a photoconductive material. Toner.The charge transport medium includes the above-mentioned electrically insulating resin and charge material 1t, such as polyvinylcarbazole, phenanthrene, N-ethylcarbazole, 2,5-diphenyl-1,3,4-oxadiazole, 2.5-bis-(4-diethylaminophenyl)-
1,3,4-oxadiazole, bis-diethylaminophenyl-1,ro-6-oxadiazole, 4,4'-
Bis(diethylamino)-2,2'-dimethyltriphenylmethane, 2,4,5-to1,1aminophenylimidazole, 2,5-bis(4-diethylaminophenyl)-1,ro,4-triazole , 1-phenyl-3-
Hole transport substances such as (4-diethylaminostyryl)-5-(4-diethylaminophenyl)-2-pyrazoline, p-diethylaminobenzaldehyde-(diphenylhydrazone), 2-nitro-9-fluorenone, 2.7
-Sinitro-9-fluorenone, 2,4゜7-dolinitro-9-fluorenone, 2,415.7-tetranitro-9-fluorenone, 2-nitropenzothiophene, 2
．． 4.8-)! J=a combination with at least one electron transport substance such as trothioxanthone, dinitroanthracene, dinitroacridine, dinitroanthraquinone is used. Generally speaking, the charge transport material is a resin 10
10 to 200 parts by weight, especially 60 to 12 parts by weight per 0 parts by weight
It is preferable to use an amount of 0 parts of supernatant.

In addition to the above-mentioned essential components, the photoconductive toner used in the present invention may contain auxiliary agents known per se according to known formulations. Examples of such auxiliary agents include offset prevention agents such as waxes and pressure fixability imparting agents.

Forming into toner can be carried out by a dry method by kneading, crushing, and sieving, or by a wet method by spray granulation in the form of a dispersion, and the particle size of toner particles is generally in the range of 57"l to 60 microns. Examples of suitable photoconductive toners include phthalocyanine styrene-acrylic resin systems, phthalocyanine poly-11 ester resin systems, etc.These photoconductive toners have triboelectric charging characteristics to negative polarity. On the other hand, as a photoconductive toner having positive triboelectric charging properties, a toner containing a resin containing nitrogen atoms in the main chain or side chain of gold, such as a polyamide resin, may be used instead of the above-mentioned resin. good.

Any coating method may be employed to apply the photoconductive toner onto the conductive substrate as long as it allows for uniform application and deposition. The photoconductive toner is charged, such as by friction, and a bias charge is applied between the photoconductive toner support and the conductive substrate to electrostatically deposit the photoconductive toner onto the conductive substrate. For example, a two-component agent is prepared by mixing a photoconducting toner with a carrier, and this is applied using a two-component magnetic brush, which is known per se, on a conductive sleeve. A method is adopted in which the obtained toner is held alone on a fur brush or roller for application.

Image exposure by an original can be performed by transmission exposure through a transparent original or by reflection exposure through an opaque original.

Application of the second photoconductive toner after the first stage exposure can be performed in the same manner as the first stage application.

In this case, the second photoconductive toner is selectively applied on the first photoconductive toner whose charge has disappeared due to the first exposure using the same principle as bias development. become. The first photoconductive toner and the second photoconductive toner may have different hues, or may have the same hue and toner composition.

The second stage of exposure is performed with the second original being superimposed on the first original at a ratio of 17. By superimposing a second original on the unnecessary portion of the first original and performing a second stage of reflective exposure, a charged image of photoconductive toner corresponding to the second original can be formed. In other words, the second
In the figure, the first image exposure and the application of the second photoconductive toner result in a first charged photoconductive toner 2 in the dark areas D1 of the first document and a light area L1 of the first document. Second charged photoconductive toners 5 are respectively present, and when a layer of these toners is subjected to reflective exposure through the second document 7'ft-, the toners 5 are present in the dark area D2 of the document 7. On the other hand, in the bright areas I and 2 of the original 7, the charges of toner 2 and toner 5 disappear, and the second image exposure is performed with the effect of the first image exposure of π erased. It becomes possible to form a charge image corresponding to [,].

Of course, the present invention uses a two-stage photoconductive toner. It should be understood that the method is not limited to applying photoconductive toner and imagewise exposure, but that combinations of three, four or more stages of photoconductive toner application and imagewise exposure are possible. be. In this case, when applying the photoconductive toner in the second and subsequent stages, the bias voltage applied between the conductive substrate and the photoconductive toner application mechanism is set higher than that in the first stage. It is possible to make it possible for the toner application in the second and subsequent stages to be performed at approximately the same concentration as the toner application in the first stage.

As the transfer medium, ordinary paper, transparent resin film for overhead projectors, etc. are used, and the image is easily fixed by heat or pressure.

The invention is illustrated by the following example.

Example 1 A first photoconductive toner (blue) containing a phthalocyanine pigment negatively charged by frictional charging as a main component [7] was deposited on a 4-forming substrate, and then a transparent first original was imaged by image exposure. , an image pattern was formed on the toner.

Next, triboelectric charging (~
The main component of the perylene pigment and the second photoconductive
(red) was deposited uniformly over a first layer of photoconductive toner that had lost its charge, corresponding to the non-image areas of the transparency document.

A second original to be inserted was superimposed on the non-image area of the transparent original, and image exposure was performed to form a second image pattern on the second toner layer.

Finally, by transferring the first photoconductive toner and the second photoconductive toner, which still retain their charges, onto plain paper,
A composite two-color copy in which the blue image area from the transparent original and the red image area from the second original were integrated could be easily obtained.

Example 2゜Actual M In the process of Example 1, the same toner as the first photoconductive toner containing phthalocyanine pigment as a main component was also used as the second photoconductive toner, and the second document was reduced. By exposure, a synthetic copy of the same color blue could be obtained.

Example 6 The first photoconductive toner and the second photoconductive toner of Example 1 were used. 1f color IC in the image area of the opaque original
Separate the parts you want to color and the parts you want to red,
After covering the portion of the sample with a reflective plate-like material, the portion to be colored red was subjected to image exposure according to the process of Example 1.

Then, the reflector is removed and 1-1 image exposure is carried out on a layer of the second photoconductive toner adhering to the non-charged areas of the first photoconductive toner.

Finally, by transferring the first and second photoconductive toners, which still had a charge of 1-, onto plain paper, a copy consisting of blue and red colors could be obtained.

In this way, it was possible to easily obtain copies that included the user's German NIJ characteristics, which were separated from the original manuscript.

[Brief explanation of drawings]

1 and 2 are diagrams explaining the principle of the copying method according to the present invention. 1...Substrate 2...First photoconductive toner...First original 5...Second photoconductive toner 7... ...Second manuscript 9... Transfer media patent applicant Sanda Kogyo Co., Ltd. Figure 1

Claims (1)

[Claims] (1) A charged photosensitive toner is uniformly adhered to a conductive substrate, and a charged toner image corresponding to the first original is formed by performing image exposure using a first original, excluding a portion of the charged toner image. A second charged photosensitive toner is attached to the first original and the second original is superimposed on the first original and image exposure is performed to form charged toner images corresponding to the first original and the second original. An electrophotographic reproduction method for making a composite copy from multiple original documents, which consists of forming a charged toner image on a substrate and transferring a charged toner image on a substrate to a transfer medium.