JPS58203465A - Image synthesizing method - Google Patents

Abstract

PURPOSE:To attain an image synthesizing method where the positional deviation is eliminated with an easy operation and a synthesized image is superior in uniformity of image quality, by charging again a photoreceptor having the fixed toner image of the first original and exposing, developing, and fixing the image of the second original and repeating this stage for obtaining a synthesized copy required number of times. CONSTITUTION:A photoconductive sheet 10 is charged electrostatically by a charger 4 after supported around a rotary drum 1, and the image of the first original on a platen 3 illuminated by an original illuminating lamp 14 is projected onto the photoconductive sheet 10 to form an electrostatic latent image. This latent image is developed by a developing machine 5 and is fused and fixed onto the photoconductive sheet 10 to obtain the toner image. Next, the second original is placed on the platen 3 instead of the first original, and the photoconductive sheet 10 which carries this toner image and is wound around the rotary drum 1 is charged again by the charger 4, and the image of the second original is projected by the original illuminating lamp 14 and a projection lens 2 and is developed by the developing machine 5 and is fixed onto the photoconductive sheet 10, thus obtaining a fixed synthesized toner image of the first and the second originals on the photoconductive sheet 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image composition method for copying images of a first original and a second original onto the same recording medium using electrophotography, and particularly to an image composition method using electronic printing.

2. Description of the Related Art Conventionally, a so-called form overlay method is well known as one of the image composition methods using electrophotography, in which ordinary electrophotographic copying is performed with two types of originals superimposed on a document table. In this method, latent images corresponding to two types of originals are simultaneously formed on the photoconductor, so there is no problem in terms of uniformity of the density of the composite image I#, but it is limited to one of the originals being a transparent original. In addition, there are drawbacks such as the possibility of misalignment of the originals, which tends to cause image misalignment of the composite image, and the troublesome task of overlapping the originals for each copying operation.

Another method is to sequentially form latent images of two types of originals facing each other on a photoreceptor and to overlap them. For example, there is a method in which a photoreceptor with two laminated photosensitive layers with different photosensitive regions is used, and image exposure is performed after the charging process in which the wavelength range is changed for each document, or as shown in Japanese Patent Application Laid-Open No. 87175/1983. Another method is to sequentially perform charging and simultaneous first image exposure, charging and simultaneous second image exposure, and whole surface exposure on a photoreceptor having a transparent insulating layer provided thereon. These methods do not limit the number of originals or complicate the overlapping and alignment of originals, but because they use special photoreceptors or processes, the device configuration inevitably becomes complicated.

In addition to the poor uniformity of the image quality of the composite image, when it is desired to superimpose a number of second document images with different contents on a constant first document image such as a line or frame, it is necessary to form latent images on both documents. There is a complexity in having to repeat the process every time.

The object of the present invention is to provide an image synthesis method that eliminates the drawbacks of conventional methods, and that makes it possible to obtain a composite image with simple operations, no positional deviation, and excellent uniformity of image quality. For the purpose of providing law.

A further object of the present invention is to provide an image compositing method that can be used at high speed to obtain a plurality of copies of the same composite image and that does not require any replacement of originals.

The present invention achieves the above object by the following method.

That is, first, the electrophotographic photoreceptor is charged and image exposure of the first original is performed. Next, the atom of the first original is developed to form a toner image, and this toner is fixed on the photoreceptor. The photoreceptor carrying the fused toner image of the first document is then recharged, and the rl! of the second document is re-charged. Exposure is performed and development is performed in the same manner as for the first original to fix the toner image on the second original. In this way, a fixed toner master image of the composite image of the first original and the second original is formed on the photoreceptor. The photoconductor having this master image is charged, exposed to light over its entire surface, and developed to form a composite toner@, and the process of transferring and fixing this composite toner image to obtain a composite copy of the first original and second original is repeated as many times as necessary. This process is repeated to obtain a desired number of copies.

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a diagram showing an example of the apparatus used in the present invention, in which 1 point is a rotating drum, 2 is a projection lens, 3 is a document table, and 4 is a rotating drum.
1 is a charging device, 5 is a developing device, 6 is a transfer corotron, 7 is a flash fixing device, 8 is a cleaning device, 9 is a hot roll fixing device, 10 is a photoconductive sheet, 11 is a transfer paper, 12 is a paper discharge 13 is a uniform exposure lamp, 14 is an original illumination lamp, 15 is a cleaner lamp, 16 is a photoconductive sheet inlet, and 17 is a photoconductive sheet discharge tray.

Next, the operation will be explained.

A case where the first document is a format and the second #t, draft is a document containing numbers, characters, etc. will be explained.

First, after the photoconductive sheet 10 is wrapped around and supported by the rotating drum 1, it is charged by the charger 4, and further illuminated by the document illumination lamp 14, the first document on the document table 3 is placed on the projection lens 1.
is projected onto the photoconductive sheet 10 via the photoconductor to form an electrostatic a image. Next, the latent image corresponding to this first document is visualized by a developing device 5, and then melted and fixed onto a photoconductive sheet 10 by a 7-lash fixing device 7 to obtain a fixed toner acid. Next, a second original is placed in place of the first original on the original platen 3, and the photoconductive sheet 10, which carries the above-mentioned fixed toner image and is wound around the rotating drum 1, is again charged with a charger. Temple, by 4.

+ Turning charge, original illumination lamp 14 and throwing lens 2
The image of the second original is projected by the developer, developed by the developing device 5, and fixed by the flash fixer 7, and a fixed toner image that is a composite of the first and second originals is obtained on the photoconductive sheet 10.

Next, this composite fixed toner image is charged by a charger 4, exposed uniformly by a uniform exposure lamp 13, and then visualized by a developing device 5, after which the transfer paper 11 is transferred to the transfer section in synchronization with the rotation of the rotary drum 1. The toner image on the photoconductive sheet 10 is transferred to the transfer paper 11 by the transfer corotron 6, and then becomes a fixed image by the heat roll fixing device 9, and the toner image is transferred to the paper output tray 12.
It becomes a copy.

On the other hand, the residual toner on the photoconductive sheet 10 after the transfer is cleaned by the cleaning device 8, and -th composite image copying is completed. On the photoconductive sheet 10! The fixed toner image corresponding to the composite image of the li manuscript and the second manuscript remains as it is, and if you want to obtain multiple identical copies from now on, the charger must be continuously turned on while the rotary drum 1 is rotating at high speed. 4, uniform exposure using the uniform exposure lamp 13, development using the developing device 5, transferring the toner image onto the transfer paper using the transfer corotron 6, and cleaning the residual toner on the photoconductive sheet 10 using the cleaning device 8, which are repeated. Just do it like this.

After the fixed toner image is formed, an image exposure step is not necessary, and by switching the rotational speed of the rotary drum to a high speed, the access time until the copy is ejected can be shortened.

As the charging device, image exposure device, and uniform exposure device used in the present invention, known devices can be used.

The photoconductive sheet 10 is made of ZnO1CdS on a conductive support.
It is possible to use a photosensitive layer coated with a photosensitive layer in which photosensitive particles such as E.g. It can be used in any form such as sheet, belt, scroll, etc.

When formed into a sheet, the photoconductive sheet carrying the fixed toner image can be once discharged from the apparatus and stored for reuse. In addition, when it is made into a scroll shape, the complexity associated with feeding and discharging the photoconductive sheet is eliminated.
The device can also be simplified.

The developing method may be any conventional Koyo method such as the magnetic brush method or the cascade method, and the developer may be a two-component,
- Any of the component systems can be used.

A pressure fixing method or a heat fixing method is used to fix one image of toner corresponding to the first document onto the photoconductive sheet 10. Photoconductive sheet 10 carrying a fixed toner image
Since recharging is subsequently performed, any fixing method may be used as long as it does not cause a change in the conductivity of the photoconductive sheet 10. Heat fixing methods include heat roll fixing method,
Although the fludge constant deposition method may be mentioned, it is preferable to use the fludge constant deposition method because it simplifies the apparatus and causes less deterioration in image quality when the toner is fixedly deposited. A schematic cross-sectional view of a specific fluff fixing device suitable for use in the present invention is shown in FIG.

In the figure, 18 is a flash lamp, and 19 is a reflector. The position of the flash lamp 18 and the shape and position of the reflector 19 are set so that the toner image on the original 4-electric sheet 10 wound and supported on the rotating drum 1 can be fixed efficiently and uniformly.
The reflector 19 consists of two ellipsoidal parts each sharing one focal point, and the flash rung 18 is disposed in this shared focal point so that the recording surface is near the other focal point of each of the two ellipsoidal parts. It was placed in

As the device for recharging and the device for exposing the image of the second document, the same device used for forming the fixed toner image corresponding to the first document image may be used again, or another device may be provided.

The state diagrams on the photoconductive sheet during the formation of electrostatic latent particles, the formation of fixed toner images, and visualization corresponding to the first and second originals are shown in FIGS.

In the figure, (, ), (e), 0) are the charging process, (b) is the first original image exposure process, (c), (g), (k) are the developing process, (
d) and (h) show the fixing process, (f) the second original image exposure process, (j) the uniform exposure process, (1) the transfer process, and (e) the toner fixation process on the transfer paper. Further, 20 indicates toner particles, 21 indicates a fixed toner image, and 22 indicates a toner image on the transfer paper.

The photoconductive 7-t 10 carrying the fixed toner layer corresponding to the first document formed by the steps (, ) to (d) is placed (
By recharging in step e) and exposing the second original image in step f), the charge in the bright area of the photosensitive layer portion of photoconductive sheet) 10 flows out through the conductive support. , the charge in the dark area is retained. On the other hand, the photoconductive sheet 10
The toner image area fixed on the top acts as an optical shielding mask for the photoconductive layer directly below it, so that the charge is retained almost unaffected by the bright and dark areas caused by the exposure of the second original image. Ru. In this state, the rephenomenon step (g), (h
), the fixed toner f image corresponding to the composite image of the first and second originals becomes photoconductive 7-t1.
Formed on 0.

Next, by carrying out the charging step (i) and the uniform exposure step (j), almost all of the electric charge in the photosensitive layer portion of photoconductor 7-) 10 flows out through the conductive support. On the other hand, the charge of the toner image portion fixed on the original conductive sheet 10 remains retained by the optical shielding mask function. In this state, (k) development process, (1) transfer process)
By sequentially performing the steps of fixing the toner on the transfer paper, a copy of the composite image is obtained. Thereafter, if it is desired to obtain a plurality of identical copies, the above steps (i) to - may be repeated.

Figure 4 shows the first manuscript (,) representing the format and the symbol ・
This figure shows that a copy of a composite image as shown in (C) can be obtained by combining the second manuscript (b) representing variable contents such as characters with the method of the present invention.

As a method for cleaning the toner remaining on the photoconductive sheet 10 in the present invention, conventionally known far-plak methods, magnetic brush methods, etc. can be used.

Further, as a method for removing residual charges on the photoconductive sheet 10, conventional methods such as AC corona discharge and uniform exposure can be used.

As explained above, according to the method of the present invention, it is possible to obtain a composite image of uniform quality without positional deviation with simple operations, and it is also possible to obtain a plurality of composite image copies at high speed.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of an example of an apparatus used to carry out the method of the present invention, Figure 2 is a schematic sectional view of an example of a fludge fixing device used in the method of the present invention, and Figure 3 (11). -- are explanatory diagrams sequentially showing the steps of the method of the present invention, and FIGS. 4(a) to (c) represent examples of the 1i-th original image, the second original image, and the composite image, respectively. Symbols in the figure: 1... Rotating drum; 2... Projection lens; 3... Document table; 4... Charger; 5... Developing device; 6... Transfer coroton @ 7. ...Flash fixation i:s...
Cleaning device #: 9...Heat roll fixing device; 1o.
... Photoconductive sheet): 11... Transfer paper; 12... Output tray; 13... Uniform exposure lamp; 14... Original illumination rung; 15... Cleaner lamp; 16... - Sheet feeding port; 1711- Toner image; 22...Fixed toner image on transfer paper. (3 others) -12= 11↓1111 (a) (b) 1 (9) (h) 0) (k) (m) (C) (f) ()) Whistle 4 Figure (a) (b) (C) Procedural amendment September 2, 1981 Patent application No. 84921 No. 2, Name of invention Image synthesis method 3, Person making the amendment Relationship to the case: Name of patent applicant (549) Fuji Xerox shares Company Kasumigaseki Building Post Office P.O. Box No. 49 No. 7, subject to amendment

Claims (1)

[Claims] After charging the electrophotographic photoreceptor, image exposure of the first original is performed to obtain a latent image, and this a-image is developed to form a toner image of the first original, which is fixed and is deposited on the photoreceptor. After forming an image fixing toner acid and then recharging the photoreceptor carrying the fixed toner image, image exposure of a second original is performed to form a # image, and development is performed to form a toner image of a second original. , the combined fixed toner images of the first original and the second original are fixed on the photoreceptor, and then the photoreceptor having this combined fixed toner image is charged, uniformly exposed, developed, and combined. An image composition method characterized by forming a toner image, transferring this composite toner image to a transfer material, and then fixing it to obtain a composite image.