JPS6278575A - Image recording method - Google Patents

Abstract

PURPOSE:To transfer an image efficiently on the ordinary paper of low running cost by sticking insulating toner on a photosensitive body by using a developing device packed with insulating toner. CONSTITUTION:Insulating toner is used in place of conductive magnetic toner. With developing bias applied between a transparent conductive film 21b and the first developing device 22, insulating magnetic toner in the developing device 22 is carried, and a photosensitive body 21 is rotated. Then, the toner charged by triboelectrification adheres on the surface of the photosensitive body 21, and a uniform solid toner layer 24 is formed. Then, image exposure is made from the back of the photosensitive body 21 to the solid toner layer. Next, the toner 24 of unexposed part is recovered by electrostatic force and magnetic force using the second developing device 28. Then, a toner image 29 is electrostatic transferred on a recording paper 30 by using a transfer roller 31, and the transferred toner image 33 is fixed on the recording paper 30 by a fixing device 34. Thus, a recorded picture 35 is obtained.

Description

[Detailed Description of the Invention] [Summary of the Invention] The present invention involves forming a single layer of solid toner on a transparent base photoreceptor using insulating toner, exposing the image from the back side of the photoreceptor, and then collecting the toner in the non-exposed area. This is a method of recording an image by transferring the resulting toner image onto recording paper.

[Industrial application field]

The present invention relates to an image recording method, and more particularly to an image recording method in which a toner image is formed using an insulating toner, and the toner image is transferred and fixed onto recording paper for recording.

[Conventional technology]

Conventionally, an image recording method is known in which an image is obtained through the steps of solid development, image exposure, contrast development, transfer, and fixing using a transparent base photoreceptor.

A method using a conductive magnetic toner as the toner in this image recording method is shown in FIGS. 4A to 4D. FIG. 4A shows a rough development process, FIG. 4B shows an image exposure process, FIG. 4C shows a contrast development process, and FIG. 4D shows a transfer process.

In the solid development process shown in FIG. 4A, solid toner development is performed. First, on a transparent substrate lc made of glass, acrylic, polyethylene terephthalate, etc., a transparent conductive film 1b made of indium oxide or the like and Se-based.

A transparent Haas photoreceptor 1 is provided with a photoconductive layer 1a of CDA, A-3I, organic photoconductor, or the like. A magnetic brush developing device 2 is provided opposite the photoconductive layer 1a, and conveys a conductive magnetic toner 3. Further, a developing bias voltage is applied between the developing device 2 and the transparent conductive film lb using the power source 4, thereby performing uniform solid toner development.

At this time, charges 6 of opposite polarity corresponding to the charge amount of the adhered toner layer 5 are induced in the transparent conductive film 1b. In this case, negative charges are induced.

Next, in the image exposure step shown in FIG. 4B, image exposure is performed from the base lc side of the photoreceptor 1 according to the image pattern. Then, electron-hole pairs are generated in the photoconductive layer la, and these internal pressure holes combine with the induced charges 6 of the transparent conductive layer 1b and disappear. The electrons move near the surface of the photoconductive layer 1a and form a latent image charge 7.
becomes.

In the contrast development shown in FIG. 4C, toner in non-exposed areas is collected. A magnetic brush developing device 8 is provided opposite the photoconductive layer 1a, and conveys a four-electromagnetic toner 9. Further, the developing device 2 is set to the same potential as the transparent conductive film 1b. Then,
The charged toner lO in the non-exposed area is collected by the developing device 8 by electrostatic force and magnetic force. At the same time, the charge 6 on the transparent conductive film 1b also moves to the ground and disappears. On the other hand, in the image section,
A part of the toner is collected by the developing device 8. However, since the toner in the exposed area has a strong electrostatic binding force with the latent image charge 7, it remains on the photoreceptor l, and a toner image 11 is formed.

In the transfer step shown in FIG. 4D, the toner image 11 is transferred onto the recording paper 12. As a transfer method, electrostatic transfer such as roller transfer and corona transfer is generally used. Here, roller transfer will be explained. A recording paper 12 is placed over the toner image 11 on the photoreceptor 1, and a conductive rubber roller 13 for transfer is provided on top of the recording paper 12, and a constant pressure is applied thereto. Further, a transfer voltage is applied by the power source 14 to transfer the toner image 11 on the photoreceptor l onto the recording paper 12.
Electrostatically transfer to.

Next, the toner image 15 electrostatically transferred onto the recording paper 12 is
It is fixed by methods such as heat fixing, pressure fixing, flash fixing, etc., and becomes a recorded image.

[Problem that the invention seeks to solve]

In the conventional image recording method as explained above, conductive magnetic toner is used in the transfer process shown in FIG. Since the electric charge that it has leaks out through the plain paper, the transfer efficiency in the normal electrostatic transfer method is as low as about 50%. In order to prevent the charge leakage and increase transfer efficiency, it is necessary to use expensive special paper whose surface is treated with high resistance.

Therefore, an object of the present invention is to provide an image recording method that can efficiently transfer images onto plain paper with low running costs.

[Means for solving problems]

According to the present invention, the above problem can be solved by using a developing machine filled with insulating toner to deposit the insulating toner onto a photoreceptor formed by successively laminating a transparent conductive layer and a photoconductive layer on a transparent substrate. Image exposure is performed from the transparent substrate side of the photoreceptor to form a latent charge image near the surface of the photoconductive layer, and then charged toner adhering to non-exposed areas is removed using toner collecting means. The problem is solved by an image recording method characterized by providing a means for forming a toner image on recording paper and transferring the toner image onto recording paper.

That is, in the present invention, an insulating toner is used instead of the conductive magnetic toner in the conventional method explained in FIGS. 4A to 4D.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic diagram for explaining one embodiment of the present invention.

In FIG. 1, 21 is an organic photoconductive layer 21 with a thickness of 8 μml.
a, a transparent conductive film 21b, and a transparent substrate 21c.

Among these, the transparent conductive film 21b is connected to ground. Further, the photoreceptor 21 has an endless sheet shape and rotates in the direction of the arrow shown in the figure.

Reference numeral 22 designates a first magnetic brush developing machine for solid development, and its configuration is shown in FIG. That is, as shown in FIG.
, a sleeve 22b that holds the toner, and a blade 22c that adjusts the height of the toner. This developing machine 2
2 is filled with insulating magnetic toner 22d, and the toner is transported by rotating a magnetic roller. During toner transport, the toner 22d is transferred to the sleeve 22b and the blade 2.
It rubs against 2c and becomes electrically charged. In this embodiment, positively charged toner is used.

In Fig. 1, 23 is a developing bias (+200~
+500). 24 is a uniform solid layer, and 25 is a negative charge induced in the transparent conductive film 21b. An image exposure device 26 performs image exposure according to an image pattern, and is composed of an LED array optical system. 27 is a latent image charge near the surface of the photoconductive layer.

28 is a second magnetic brush developing machine for collecting toner;
It has the same configuration as the developing machine 22, and is connected to ground potential.

29 is a toner image formed on the photoreceptor 21;

30 is recording paper, which is a normal 4Y paper feed. 31 is a conductive rubber roller for transfer, and 32 is a power source for applying a transfer voltage (-200 to 600 V) of opposite polarity to the developing bias to the transfer roller 31. 33 is a toner image transferred onto the recording paper 30 and fixed by a pressure fixing device 34. 35 is recording paper 3
This is a semi-permanent image obtained on 0.

36 is a residual toner image remaining on the window light body 21 after the transfer. Reference numeral 37 denotes a discharge light source for canceling the latent image charge 27 in the photoconductive layer 21a.

38 is an AC corona discharger for removing the electric charge of the residual toner 36, and 39 is its power source. Reference numeral 40 represents residual toner that has lost its binding force due to static electricity removal.

Next, the image recording method will be explained.

With a developing bias applied between the transparent conductive film 21b and the first developer 522, the insulating magnetic toner in the developer a22 is transported and the photoreceptor 21 is rotated.

Then, the triboelectrically charged toner adheres to the surface of the photoreceptor 21, forming a uniform layer 24 of solid toner.

Along with this, negative charges 25 are induced in the transparent conductive film 21b.

Next, image exposure is performed on the single layer 24 from the back side of the photoreceptor 2. Then, electron-hole pairs are generated in the photoconductive layer 21a, and these white holes combine with the induced charges 25 of the transparent conductive layer 21b and disappear. The electrons move near the surface of the photoconductive layer 212 and become latent image charges 27.

Next, the second developing device 28 is used to collect the non-exposed area toner 24 using electrostatic force and magnetic force. At this time, a small amount of the toner in the exposed area is recovered, but because of the strong electrostatic attraction with the latent image charge 27, most of the toner remains on the latent image window light body 21, forming a toner image 29.

Thereafter, the toner image 29 is electrostatically transferred onto the recording paper 30 using the transfer roller 31, and the transferred toner image 33 is fixed onto the recording paper 30 by the fixing device 34, thereby obtaining the recorded image 35. On the other hand, the residual toner 36 on the photoreceptor 2I
Since both the charge of the toner 36 and the latent image charge 27 are removed by the charge removal light a37 and the AC corona charge remover 38, the toner 36 and the latent image charge 27 are collected by the developing device 22 without losing their electrostatic attraction. At the start of the next image recording process, solid development is performed simultaneously with residual toner collection.

In this example, electrostatic transfer to plain paper was made possible by using an insulating magnetic toner. As a result, “Pf
An image recording of sufficiently high optical density was obtained on the passed paper.

FIG. 3 is a schematic diagram for explaining another embodiment of the present invention.

The difference from the embodiment of the present invention shown in FIG. 1 is that non-magnetic toner is used as the insulating toner.

In conjunction with the use of non-magnetic toner, the following three points were further changed.

■ A two-component developer consisting of a carrier made of fine iron powder and an insulating non-magnetic toner was used. ■Second developing machine 28
A bias voltage of opposite polarity to the charged toner was applied to the charged toner. ■
After transferring the toner image 29 onto the plain paper 30, an AC corona static eliminator 3 removes the electric charge of the toner 36 remaining on the photoreceptor 21.
8 is replaced by a fur brush cleaner 41, and a toner removing means for removing residual toner 36 from the photoreceptor 21 is provided.

In this embodiment, since non-magnetic toner can be used, color toner can be used, which has the effect of making it easier to realize a color bird copying apparatus.

Note that in the embodiments shown in FIGS. 1 and 3, the first
Although the developing machine and the second developing machine are shown separated, in actual use, the first developing machine and the second developing machine are integrated, and the insulating toner collected by the second developing machine is The first
The structure is such that it can be transported to a developing machine and reused.

〔Effect of the invention〕

As explained above, according to the present invention, an insulating toner is used in an image recording method in which an image is recorded through the steps of solid development, image exposure, contrast development, transfer, and fixing using a transparent base photoreceptor. This enables electrostatic transfer to plain paper with low running costs.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining one embodiment of the present invention, FIG. 2 is a schematic diagram showing the configuration of the developing machine shown in FIG. 1, and FIG. 3 is a schematic diagram for explaining an embodiment of the present invention. FIG. 4A, FIG. 4B, FIG. 4C, and FIG. 4D are schematic diagrams for explaining examples.
The figure is a schematic diagram for explaining a conventional image recording method. 1.21...Transparent base photoreceptor, la, 21a...photoconductive layer, lb, 21b...transparent conductive film, lc, 21c...transparent substrate, 2.8...magnetic brush developing machine , 3.9... Conductive magnetic toner, 4.14.23.39... Power supply, 5... Adhesive toner layer, 6... Induced charge, 7.27... Latent image charge, 10 ...Charged toner, 11.15.29...Toner image, 12...Recording paper, 22...First magnetic brush developing machine, 22a...Magnet roller, 22b...Sleeve, 22C ...Blade, 22d...Insulating toner, 24...Solid toner layer, 25...Negative charge, 26...Image exposure device, 28...Second magnetic brush developing device, 30...・Recording paper, 37... Static elimination light source, 38...
AC corona discharger, 40...Residual toner.

Claims (1)

[Claims] 1. A developing machine filled with insulating toner is used to adhere the insulating toner onto a photoreceptor formed by successively laminating a transparent conductive layer and a photoconductive layer on a transparent substrate, and then the transparent substrate of the photoreceptor is coated with the insulating toner. Image exposure is performed from the side to form a latent charge image near the surface of the photoconductive layer, and then charged toner adhering to non-exposed areas is removed using a toner collecting means to form a toner image; An image recording method comprising: means for transferring the toner image onto recording paper.