JPS58202464A - Picture forming device - Google Patents

Abstract

PURPOSE:To control easily a copy, by inserting an optional discriminating picture in a copy which forms an original picture by an electrophotographic process using an image carrying body, by a color for which said image carrying body has sensitivity. CONSTITUTION:A visible image 16 on a photoreceptor 1 is transferred to a transfer material 17, between the photoreceptor 1 and a transfer electrostatic charger 5, and therefore, when the transfer material 17 separated from the photoreceptor 1 passes through the lower part of an ink jet head 27, a position signal is inputted to a CPU23 from a Hall element 30. An optional discriminating picture signal to be inserted onto the transfer material 17 is inputted in advance to the CPU23 by a keyboard 24, and the CPU23 reads out an information signal corresponding to the discriminating picture signal in accordance with a received position signal, controls an ink jet driving circuit 26, drives the ink jet head 27, and inserts a discriminating picture 22 to the outside of an area E for forming an original picture on the transfer material 17. By this discriminating picture, it becomes clear to be copy, and the copy is controlled easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus such as an electrophotographic copying machine or an electrostatic recording machine, and particularly to an image forming apparatus having a function of imprinting an arbitrary image along with a document image.

Hereinafter, an explanation will be given using an electrophotographic copying machine as an example. Manuscript 1 that the author does not want to be copied as copying machines become obsolete.
For example, there is a risk that the author's information or official documents such as nine banknotes may be illegally copied or rendered useless.

Conventionally, as a countermeasure against the above situation, by putting a watermark on paper that will deteriorate when it is copied, and copying it, the watermark is either not copied, or conversely, the watermark is too dark to make it clear that it is a duplicate copy. Nothing has been done to make it easier to identify. However, the raw material is extremely expensive as the paper quality is 1 to 11 trillion, and it is necessary to prevent the paper from being used for first-hand paper, so it is currently difficult to obtain it to the general public. .

The present invention has been proposed in view of the above, in which an arbitrary identification image is imparted to a copy of an original image formed by an electrophotographic process using an image carrier in a color to which the image carrier is sensitive. The purpose of this is to make it easier to manage the first yo-nose and to prevent the above-mentioned identification image from becoming a 21st copy when that Shun'X9jj is taken as a P+ first copy as a manuscript.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the image forming apparatus according to the present invention will be described below with reference to the drawings. Figure 1l-1: Shows the first embodiment.

Reference numeral 1 denotes a drum-shaped photoreceptor as a carrier that is rotationally driven in the direction of the arrow, and a vapor-deposited film of SeTe (containing 10 wt% of Te) 1b is provided on the surface of the aluminum drum 1a to a thickness of about 40 μm. The configuration is as follows. 2 to 7 are photoreceptors 1
2 is a corona charger.

6 is an optical image exposure station, 4 is a developing device, 5 is a transfer charger, 6 is a cleaner, and 7 is an all-W exposure lamp for T removal.

The photoreceptor 1 is charged with a corona charger 2 during its rotation in the direction of the arrow.
At the optical image exposure station 3, the reflected image from the document 11 on the transparent document tray 10, which has been illuminated by the halogen lamp 9, is reflected by the lens 12. An image is formed through an optical system consisting of a mirror 16 and a slit 14.

A latent image 15 is formed with a shadow corresponding to this image pattern.

Next, this electrostatic latent image is developed with toner by the developing device 4 to become a visible image 16.

Transfer material 17Fi paper feed roller 18. Timing roller pair 1
The cassette 2 is synchronized with the rotation of the photoreceptor 1 by the cassette 9.
The ciTa image 16 on the photoreceptor 1 is transferred onto the transfer side 17 by the charging action of the transfer charger while the photoreceptor 1 and the transfer belt move between the device 5. Transfer strip 1
The transfer material 17 that has passed through the kL position is separated from the photoreceptor 1 and conveyed to the fixing roller 21. On the other hand, the surface of the photoreceptor from which the rolled material has been separated is cleaned with a cleaner 6 to remove all the toner remaining after transfer.

The residual charge is removed by fog light from the full-surface exposure lamp 7, and the area is purified and used again for image formation.

On the water side, an arbitrary identification image 22 (FIG. 2) is imprinted onto the transfer material 17 after the fixing has been completed after passing through the fixing roller 21, and this imprinting means is used by the central processing unit 23 (hereinafter referred to as C
, PU), keyboard 24° read/write memory 25. Inkjet drive circuit 26. Inkjet head 27. Timer 28° magnet 29 and Hall element 30
It consists of a position detector.

The magnet 29 is added to the photoreceptor 1, and the ball element 30
is placed on the side plate of the device, facing the movement locus of the magnet 29. And as mentioned above.

As the image formation on the photoreceptor 1 and the transfer of the image onto the transfer material 17 progresses, and the transfer material 17 separated from the photoreceptor 1 passes below the inkjet head 27, the magnet 29 moves to the Hall element. A position signal is output from the Hall element across the front surface of the sensor 3o.

In the above configuration, an arbitrary identification signal to be imprinted on the transfer material 17 is inputted to the CPU 23 using the keyboard 24. This CPU 23 receives input 11. * Read/write information signal corresponding to the identification image signal to the memory 25
When the position signal is received from the Hall element 30, the inkjet drive circuit 26 is controlled according to the read information signal and the timer 28 is started. The inkjet drive circuit 26 drives the inkjet head 27 to imprint an identification image 22 based on the information signal outside the area E on the transfer material 17 where the original image is to be formed, as shown in FIG. And CPU2
5Fi identification image imprinting operation After a predetermined period of time has passed since the beginning of the tuna,
Upon receiving a stop signal from the timer 28, it becomes inactive and stops the identification image imprinting operation.

The identification image is inputted using the keyboard 24.
Since λ can be changed arbitrarily depending on the image signal, by determining a specific identification image depending on the recipient of the copy, it is possible to clearly identify this distinguishable image as a copy. And 14th, it is easy to know where to distribute the copies.

1. When copying a copy as a layered material.

If the above identification image is framed, it will overlap with the identification image imprinted by the inkjet head 27, which will degrade the printing quality.

Therefore, in order to form an identification image, the color of the ink of the inkjet 27 is adjusted to match the spectral degree of the photoreceptor 1. In other words, by setting the photoreceptor to a color to which it has no sensitivity, the electrical charge on the photoreceptor part that receives the reflected light from this identification image disappears and becomes the same as the bright part of the original rod, so that the identification image is not copied. . for example.

Since the spectral illuminance of the Se Teg light material (containing 10 wt % Te) is as shown in Figure 3, we selected a dye for the ink that has a reflection spectrum in this wavelength range, and used Varifast Yellow + 3104 (Orient (Chemical) was chosen. For this dye "1o", ζ-caprolactone r50. J.

Sulphoran: ``I diluted it with 40 bottles and lost the ink.

After forming an identification image on the printed material using this ink, when this copy is re-copied as a document using a halogen lamp as the illumination light source for the document 1 and Se Te (containing 100 wt % of Te) as the photoreceptor, the above identification No images were copied.

In this example, ink is ejected from the inkjet head 27 and attached to the transfer material 17 as described above.

The ink is soaked into the IT transfer material to form an identification image.As a result of experiments, good results were obtained by using the transfer material shown in the table below. Proposed to JP-A No. 5
In addition to the method that generates ink mist using thermal energy disclosed in Publication No. 4-59936, there are TeLetype method (U.S. Patent No. 3060429), Sweet method (U.S. Patent No. 3596275, U.S. Patent No. 3298030), and Herty method (U.S. Patent No. 3298030). 3416153),
5tenrne method (US Patent No. 3,747,120)
It is also possible to apply an inkjet method such as the following.

In addition to the process shown in Figure 1, the electrophotographic process includes
The nNP process disclosed in Japanese Patent Publication Nos. 42-23910 and 43-24748 can also be applied.

FIG. 4 shows a second embodiment of the present invention.

This is an example in which a transfer material 17 is placed on a path between the photoreceptor 1 and the transfer charger 5, and an identification image is imprinted onto the transfer material by an inkjet head 27.

FIG. 5 shows a third embodiment of the device of the present invention.

This is an example in which an identification image is imprinted onto the transfer material 17 using a semiconductor laser instead of the inkjet method. During the first rotation of the photoreceptor 1, a document image is formed on the photoreceptor by the same electrophotographic process as shown in FIG.
．． Transfer material 1 fed by timing roller pair 19
7 is wound and supported, and the upper neck e original sum image which has been subjected to rF* on the photoreceptor is transferred to this transfer material by a known transfer means.

Then, during the second rotation of the photoreceptor 1, the developing device 4 is moved away from the photoreceptor, and the developing device filter 3 is brought closer instead.

The CPU 23 controls the semiconductor laser drive circuit 4 using information signals read from the read/write memory 25.

This semiconductor laser drive circuit coarsely moves a semiconductor laser generator 5 and transfers the generated semiconductor laser 9 onto a transfer material on which an original image is formed.

After the rolling material 17 has reached a certain stage, it is separated from the transfer drum 32 and is fed by a pair of paper feed rollers 36 toward the discharge port. The toner in the developing device 36 is a color different from that in the developing device 4 and a color to which the photoreceptor 1 is sensitive. and a first image forming means for forming an image.

Since the image forming apparatus is equipped with a second image forming means for forming the identification image of the image in a color to which the image carrier is sensitive, the identification image is not copied on the copy of the original image. It is possible to clearly determine that a copy is a copy based on the error image.

Also,! ! #You can change the image as you like.

By imprinting an identification image specified according to the destination of the copy onto the copy, the management of the copy is facilitated. Further, by setting the color of the identification image to a color to which the image carrier is sensitive, the identification image can be reproduced.

When everything is reproduced as a manuscript using the electrophotographic process,
The identification image is not copied onto the copy. Therefore.

By imprinting the identification image on this copy, effects such as being able to obtain a copy of the same high quality as when directly copying from the original can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the apparatus of the present invention, FIG. 2 is a front view of a copy made with the apparatus of the present invention, and FIG. 6 is a characteristic diagram of the wavelength versus relative sensitivity of the image carrier. FIG. 4 is a block diagram of essential parts showing a second embodiment of the apparatus of the present invention, and FIG. 5 is a schematic block diagram showing a sixth embodiment of the apparatus of the present invention. 1 is a photoreceptor, 27 is an inkjet head, and 35 is a semiconductor laser generator.

Claims (1)

[Claims] (1) A first image forming means that forms an image from a document by an electrophotographic process using an image carrier, and a second image forming unit that forms an arbitrary identification image in a color to which the image carrier is sensitive. An image forming apparatus comprising means.