JPS63174072A - Electrophotographic recording system - Google Patents

Abstract

PURPOSE:To eliminate the need for a corona discharger and to improve the reliability of a system and reduce the size by applying a voltage between an outside resistance layer and an inside transparent conductive layer formed across a photosensitive layer. CONSTITUTION:The transparent electrode layer 13, photosensitive layer 14, and resistance layer 15 are vapor-deposited in order on the surface of a transparent base body 12 to form a recording body 11. A voltage applying means 14 applies a voltage -VC between the layers 13 and 15 to charge the surface of the layer 15 electrostatically and uniformly and the recording body 11 rotates in said state as shown by an arrow A. Then an image exposing means 17 facing a developing means 18 applied with a developing bias voltage -Vd performs image exposure to generate photocarriers 21 in the photosensitive layer 14, and the carriers move to the border between the layers 15 and 14 to neutralize surface charges of the layer 15, and consequently a toner image 22 is obtained from latent image charges and transferred by a rubber roller transfer device 19 by charging the recording paper 10 from behind. Therefore, a high-voltage power source is not required, the influence of humidity and coarse particles is not exerted, and the improvement of the reliability and the size reduction are attained.

Description

[Detailed Description of the Invention] [Summary] The present invention consists of forming a recording medium by sequentially laminating a photoreceptor and a resistive layer on the surface of a transparent substrate, applying a voltage to the resistive layer to uniformly charge it, and disposing it on the side of the transparent substrate. The present invention relates to an electrophotographic recording system in which a latent image is formed and developed simultaneously by an image exposing means and a developing means arranged oppositely with a recording medium in between (industrial application field). This invention relates to an image forming method that does not use a discharge device.

Currently, electrophotographic recording systems are widely used in copying machines and optical printers, and recording is performed through processes such as charging, exposure, development, transfer, and cleaning.

[Conventional technology]

FIG. 3 shows a schematic diagram of a conventional electrophotographic recording system. In the figure, ■ is a recording medium, on the surface of which a photoconductive layer 2 of selenium or the like is laminated, rotated in the direction of arrow A, and uniformly charged on the surface of the recording medium by a corona discharger 3. Next, an image light is irradiated by an image exposure means 4 consisting of a laser or the like, and an electrostatic latent image corresponding to the image light is formed on the surface of the recording medium (an inverted image where the potential of the part to which the toner is to be attached is lowered).
is formed, and then black fine particle toner is applied by a developing device 5 to visualize the electrostatic latent image.

In this case, the toner is charged to the same polarity as the charge charged by the corona discharger 3, and is electrostatically deposited on the recording medium 1 by an electric field to be developed. Next, the toner image is transferred to the recording paper 10 by charging the recording paper 10 with a polarity opposite to that of the toner using the corona discharger 6.
The transferred toner image on the recording paper 10 is thermally fixed by the fixing device 7.

Further, the toner remaining on the surface of the recording medium is removed by neutralizing the charge on the recording medium 1 and the charge of the toner by a charge eliminating corona discharger 8, and the residual toner having no binding force is removed by a fur brush 9.
In addition to removing and cleaning the recording medium)
The surface potential of the image forming layer is set to approximately zero, and a series of image formation and transfer steps are repeated.

[Problems to be Solved by the Invention] The conventional electrophotographic recording system described above uses a corona discharger 3, 6.8 for charging and eliminating static electricity, and the corona discharger applies a high voltage of several KV to a corona wire. Since this configuration requires a high voltage source and is easily affected by humidity and dust, it has the drawback of low reliability.

Furthermore, the ozone generated by the corona discharger produces odor, and the large amount of ozone has an adverse effect on the human body. Furthermore, charging, exposure, and development.

Since six processes, including static elimination and cleaning, are required, the device has the drawback of becoming complex and large.

The present invention was created in view of the above-mentioned conventional drawbacks, and an object of the present invention is to provide an electrophotographic recording method that does not use a corona discharger.

[Means for solving problems]

The electrophotographic recording system of the present invention is illustrated in the principle diagram shown in FIG.
As shown in the layout diagram of FIG. 2 corresponding to the figure, the transparent substrate 1
2, a photosensitive layer 14 on the surface of the transparent conductive layer 13, and a resistive layer 15 on the surface of the photosensitive layer 14 are sequentially laminated as the photoreceptor 11, and the transparent conductive layer 13 and the resistance layer 15, and the recording medium 11 is rotated,
Image exposure means 1 is placed on the transparent substrate 12 side on the rotation path.
7, and a developing means 18 is provided at a position opposite to the image exposing means 17 with the recording medium 11 sandwiched therebetween.

[Effect]

The resistive layer 15 on the surface of the recording medium 1) rotates while being uniformly charged by a voltage applying means 16 provided to apply a voltage between the transparent conductive layer 13 and the resistive layer 15. In the developing section 20, the image exposure means 17 and the development means 18 are disposed opposite to each other with the recording medium 11 in between, so photocarriers are generated in the photosensitive layer 14 by image exposure, and the photocarriers 21 are generated by the uniform charging electric field of the resistive layer 15. moves to the interface with the resistive layer 15 and forms a latent image charge, and at the same time, the developing device 1
The toner on the 8 side is attracted to the latent image charge, and a toner image 22 is formed.

Also, a rubber roller transfer device 19 performs transfer onto the recording paper 10.
transfer by applying a bias voltage +Ve of opposite polarity to the toner image 22 from the back side of the recording paper 10, and weakening the binding force of the residual toner on the resistance layer 15.
Eliminates the need for conventional corona static eliminators.

By incorporating the process in this way, a toner image can be formed without using a corona discharger.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

Note that, in order to make the explanation of the configuration and operation easier to understand, the same parts are given the same reference numerals throughout all the figures, and repeated explanation thereof will be omitted. In this embodiment, a case will be described in which a functionally separated photoreceptor member including a charge generation layer and a charge transport layer is used as a photoreceptor. Of course, the same results can be obtained when a single-layer photoreceptor member having both the functions of a charge generation layer and a charge transport layer is used.

FIG. 2 shows a sectional layout diagram of essential parts of the electrophotographic recording system of the present invention, which corresponds to the principle diagram of FIG. 1. In the figure, reference numeral 11 denotes a recording body used in the present invention, and the recording body 11 has a cylindrical (endless) transparent conductive layer 13 laminated on the surface of a transparent substrate 12. It has a structure in which a photosensitive layer 14 is laminated and a resistive layer 15 is laminated on the surface of the photosensitive layer 1i14.

16 is a voltage applying means (voltage -Vc) for applying a voltage between the transparent conductive layer 13 and the resistor 1i15, 17 is an image exposing means for the photosensitive layer 14, and 18 is an image exposing means 17 with the recording medium 11 in between. A developing means is disposed opposite to the developing means, to which a bias voltage -Vd is applied. Reference numeral 19 denotes a rubber roller transfer device that applies voltage +Ve from the back side of the transfer portion of the recording paper 10. Note that the conventional static eliminating corona discharger 8 is omitted in this embodiment.

The principle of FIG. 1 will be explained below with reference to FIG. FIG. 1(a) is a diagram for explaining the uniform charging state of the resistance layer 16, in which a transparent conductive layer 13 such as indium tin is placed on the surface of a cylindrical transparent substrate 12 such as an acrylic drum or a polyethylene terephthalate film. Deposit oxide (ITO).

A photosensitive layer 14 consisting of a charge generation layer using a phthalocyanine-based material or a selenium-based material and a charge transport layer using an oxazole-based material is sequentially deposited on the surface of the transparent conductive layer 13, and a resistive layer 15 is further formed on the surface thereof. The recording body 11 is formed by vapor deposition. Instead of forming layers by vapor deposition, a coating method may be used.

The charge generation layer and the charge transport layer constitute a functionally separated photoreceptor, and the same applies even if a single-layer photoreceptor having both of these functions is used.

Voltage application means 16 between the transparent conductive layer 13 and the resistor Fi 15
As a result, the recording medium 11 rotates in the direction of arrow A while the surface of the resistance layer 15 is uniformly charged as shown in FIG. 1(b).

In the developing section 20, an image exposing means 17 is disposed on the transparent substrate 12 side with the recording medium 11 in between, and a developing means 18 to which a developing bias voltage -Vd is applied is disposed facing the resistive layer 15 side.

FIG. 1(C) is a diagram for explaining the exposure state of the photosensitive layer 14, in which photocarriers 21 are generated in the photosensitive layer 14 by image exposure by the image exposure means 17, and the resistive layer 15 and Moves to the boundary of the photosensitive layer 14 and resistive layer 1
The surface charge of 5 is neutralized to form a latent image charge as shown in FIG. 1(d).

Here, since the resistance layer 15 has a high surface resistance of 101zΩ/nuI" or more, the resistance layer 15 in the developing device has a high surface resistance of 101zΩ/nuI" or more.
The toner charge in contact with 5 reacts and is developed to form a toner image 22, thereby obtaining an image.

The transfer section does not use a corona discharger, but uses a rubber roller transfer machine 1.
Transfer can be performed by applying a bias voltage element Ve having a polarity opposite to that of the toner image 22 to the toner image 22 to charge the recording paper 10 from the back side. At this time, the residual toner can be cleaned only by the action of the fur brush 9, without using the static eliminating corona discharger 8 as in the conventional case, since the binding force of the residual toner is reduced by the bias voltage +Ve.

〔Effect of the invention〕

As explained in detail above, according to the electrophotographic recording method of the present invention, there is no need to use a corona discharger, so a high-voltage power supply is not required, and it is less susceptible to the effects of humidity and dust. Improves sex. Furthermore, since the number of parts surrounding the outer periphery of the drum can be reduced, size reduction is possible.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a cross-sectional layout diagram of essential parts of the present invention, and FIG. 3 is a schematic diagram of a conventional electrophotographic recording system. 1 and 2, 11 is a recording body, 12 is a transparent substrate, 13 is a transparent conductive layer, 14 is a photosensitive layer, 15 is a resistive layer,
Reference numeral 16 represents voltage application means, 17 represents image exposure means, and 18 represents development means. (Q) Agony/v1; Toukun charged wand "rAtb> Resistance layer surface telegraph (C16' Shiba layer 1-sha t) Exposure clothes "Ein-tei starting morning glue 1 cutting heat,!! place n Uraichu resistance arrangement Old figure 2

Claims (1)

[Claims] A transparent conductive layer (13) on the surface of the transparent substrate (12), a photosensitive layer (14) on the surface of the transparent conductive layer (13), and the photosensitive layer (1
4) A photoreceptor in which a resistive layer (15) is sequentially laminated on the surface thereof is used as a recording medium (11), and a voltage is applied between the transparent conductive layer (13) and the resistive layer (15). A means (16) is provided, and an image exposure means (17) is provided on the side of the transparent substrate (12) on the rotation path for rotating the recording body, and exposing the image with the recording body (11) in between. A developing means (1) is located at a position opposite to the means (17).
8), the surface of the recording medium (11) is uniformly charged by the voltage applying means (16), and then latent image formation and development are performed simultaneously by the image exposing means (17) and the developing means (18). An electronic photographic recording method characterized by: