JPS5950458A - Formation of electrostatic latent image - Google Patents

Abstract

PURPOSE:To eliminate the need for Corotron, by applying a voltage between the conductive substrate and beltlike electrodes of a photoreceptor consisting of the conductive substrate, insulation layer, beltlike electrodes and photoconductive layer, and injecting electric charge in the photoconductive layer then maintaining the substrate and the electrodes at the same potential and exposing an image to the photoreceptor. CONSTITUTION:An insulation layer 2 of polyester, etc. is provided on a conductive substrate 1, and beltlike electrodes A1-A3 of Al or others are formed thereon, then a photoconductive layer 4 is provided thereon. A voltage is applied between the substrate 1 and the electrodes A1-A3 and electric charge is injected into the layer 4. The injected electric charge arrives at the surface of the layer 4 and is trapped thereon. If the electrodes A1-A3 and the substrate 1 are then set at the same potential, the state similar to the state when corona discharge is performed is realized. An image is exposed on the surface of such photoreceptor, by which the electric charge on the surface is neutralized in the incident part of light and an electrostatic latent image is formed. The need for Corotron is thus eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming an electrostatic latent image, and more particularly to a method for forming an electrostatic latent image that does not require corona;

In the conventional photographic method, the Tsubakihata photoreceptor 2 is charged with corona ions and then exposed to light.
F1? is formed. However, the characteristics of the corona charger that generates corona ions change due to toner contamination, etc., which is one of the major factors that reduce the reliability of the device.In addition, ozone generated during corona charging and other active chemical species are not only harmful to the human body, but also increase the conductivity of the photoreceptor surface, causing blurred images and white spots.Furthermore, the voltage applied to the corotron is as high as several kilovolts. Yes, the cost of power supply is high (
There is also the drawback of becoming.

As an electrophotographic method that does not use Corotro/
A method using an electrodough board described in No. fl 54-61534 is known, but this method has some disadvantages, such as exposing from the back side of the photoreceptor and developing and exposing at the same time. The disadvantage is that the first part is complicated.

The present invention improves the above-mentioned drawbacks and provides a new method for forming static K i grooves in which the arrangement of the optical system and the developing system is the same as in the usual electrophotographic method, and a corotron is not required.

That is, the present invention applies a voltage between the conductive support and the iF-shaped electrode, which are present across the insulating columnar layer of the photoreceptor, which is composed of the conductive support, the insulating layer, the strip electrode, and the photoconductive layer. By applying electric charges to the light 4'r...f1' from the strip electrode, the strip electrode and the conductive support are then exposed to the same potential to form an electrostatic latent image. It is characterized by:

Hereinafter, details of the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view of a photoreceptor used in the present invention. Here A, A2. A3, -- An-4, An -- shows the strip-like electric conductors 4@ arranged in parallel. FIG. 2 is a cross-sectional view of the photoreceptor. In the figure, 1 is a conductive support, on which an insulating layer 2 is provided. Strip-shaped electrodes 3 are provided in parallel on the insulating layer 2, and a photoconductive layer 4 is further provided on the second side thereof.

As the conductive support 1 of the photoreceptor σ), a wide variety of materials such as resin, metal, and a glass film whose surface is subjected to conductive treatment can be used.

For the insulating layer 2, a polymer resin such as polynisdel, polycarbonate, polyurethane, acrylic resin, silicone resin, Teflon resin, etc. can be used, and the thickness thereof is 5 to 5.
10011m is appropriate.

'i':j:(Is 'e= (M 3 jX, At
, A9, Cr, N (, Au, Zn, Cu, etc.) are vapor-deposited and then chemically etched to form a Y-shaped pattern, or between parallel strips [the above through a mask having a After being deposited on a metallic insulating layer,
It can be formed by removing the mask.

This oblong type) box 0) p”J is 500’h ~ 5μ
mσ] is desirable.

・1'17-shaped i Electrode spacing 4
Approximately 0 to 1100zt is desirable.

As the photoconductive layer 4, Se, 5eTe-SeA++
, 5e AsTe, etc., amorphous Si:H (1), CdS or ZnO inorganic photoconductive powder dispersed in a binder resin, etc. can be used. It is also possible to form the photoconductive layer as two layers, a charge generation layer and a central transport layer. Organic semiconductors such as Shir, Ni, Melo7anine, Biririuno, Salt, etc. can be used.In addition, organic semiconductors that are almost transparent to visible light can be used as the electron transport layer. For example, a polymeric organic semiconductor such as polyvinylcarbazole (PVK) or a molecular fraction of a low-molecular electron-donating substance in a resin such as polycarbonate or polynispule can be used.Low-molecular electron-donating As a substance, anthracene, 2
, 6-dimetherene, 7-enanthrene, -pyrene, coronene, etc., fused poly-JR compounds such as diphenylamine, cina7thylamine, triphenylamine, tri-tri/shi'7-mi7, N, N, N', N'- Tetraphenyl-1,3(and-1,4)-7enylenedi'amine, N , N , N', N'-tetrabenzyl-
1,3(and-1,4)-phenylenediamine, N,N
, N', N'-tetra[2-methylbenozyl) -1,
3(and CF-1,4)-phenylenediamine, N,
N, N', N'-tetra[4-chlorobenzyl] -1
,3(and-1,4)-7enylenediamine,N,N,
N', N'-tetraphenyl-[1,1-piphenyl]
-4,4'-diamine, N, N'-diphenyl-N
, N'-bis-[3-methylphenyl]-[1,1
Aromatic amine compounds such as '-biphenyl]-4,4'-diamine, 4,4'-bis-(N,N-airamino]tetraphenylmethane, 2-[4'-dimethyl゛r
Oxazole derivatives such as [minophenyl]-5-phenyl-oxazole, Notiazole iJ conductors such as 2-[4'-dimethylamine phenylcubenzthiazole, etc.
- [4'-chlorophenyl] - Imidazole derivatives such as 4,5-diphenyl imiguzole, 1.3.5-
) liphenylpinzoli/, l-phenyl-3-(4'
-dimethylaminostyryl]-5-(4"-dimethylaminophenylcupirazoline, 1-phenyl-3-[4
2,5-bis-[4'-dimethylaminophenyl 3-
1゜3.4-Oquinacyazole, 2,5-bis-[4'
-Diethyl-r-minophenyl:] -] 1.3.4-Ochylidiazole derivatives of ogizanazole, carbazole and carbazole derivatives such as N-ethylcarbazole, N-isoglobil-rubazole, N-phenylcarbazole, and benzcarbazole are used. be able to.

Preferably, the thickness of the photoconductive layer is between 5 and 80 μm.

Next, the method for forming a quiet coastal area of the present invention will be explained. As shown in FIG. 3, a voltage is applied between the support 1 and each strip 11L pole (here (denoted as Al, A2, and A3)).Thereby, the strip electrode Charge injection from the photoconductive layer into the photoconductive layer occurs. This charge injection can be easily achieved by selecting the electrode material, and the desired charge injection can be caused by the relationship between the work function of the photoconductive material and the electrode material. I can do it.

In other words, if an electrode material with a work function larger than that of the optical guide material is used, holes can be injected, and vice versa.
Electrons can be injected by using Togoku-Shika, which has a work function smaller than that of the m-material.

Here, we will consider the case where a positive voltage is applied to the strip electrode and a regular product is injected. The injected charges reach the surface of the optical columnar layer and are discharged here.

Therefore, by setting the large electrode and the conductive support in a four-sided arrangement, a state similar to that of positive corona charging as shown in FIG. 4 is realized. Next, by exposing the surface of the photoreceptor to 1 [ψ light, the charges of M' in the light incident area are neutralized and electrostatic charges i'fl4 are formed.This process is illustrated in Figure 5 and... Shown in Figure 86.

By performing the development, transfer, 7, and fixing steps in the same manner as in the normal electrophotographic method, it is possible to achieve a final recording +lii r image.

Next, let me explain about the embodiment of the present invention. A 25 μm thick poly varnish film is adhered to an At board using an ebay-based bonding R agent, and the shoulder width is 60 tt and the pitch is 120 μm. A metal mask having a strip-shaped opening j5X was superimposed, and KNi was evaporated to a thickness of about 0.5 l, and then the metal mask was removed to obtain a strip-shaped electrode.A resistive heating type evaporation source was placed on top of this. Se was evaporated to a thickness of 30 μm.

The conductive support is then grounded and each strip electrode is connected to +600 V.
was applied for about 0.5 seconds, and then each strip electrode was grounded.

Next, after performing image exposure on the surface of the photoreceptor, negative jCfj7
'A toner fψ was obtained on the surface of the photoreceptor by using the marketed toner. When this toner image was transferred and fixed onto recording paper, a good quality of both 1@ was obtained.

[Brief explanation of the drawing]

Figure 1 is a plan view of the Y1 body (the feeling of using wood and 1-light),!
Figure -b2 is the same (cross-sectional view of the photoreceptor, Figures 3 to 6 are explanations of the method of the present invention, Shikoku. Code in the figure: 1... conductor 1i (r, sexual support: 2...・Insulating layer; 3
...17-like 11-4<; 4-:)Y
:;, 'iri construction work no. Figure 1

Claims (1)

[Claims] 2h'')!'r, P-1: Support -L ICt,! Edge IN, 5, a strip electrode, and a photoconductive layer are sequentially provided on the insulating layer of the photoreceptor, which is sandwiched between the conductive layers present at X7. After injecting a charge from the strip electrode to the photoconductive layer by applying a voltage between the polar support and the strip electrode, imagewise exposure is carried out with the polar support and the strip electrode at the same potential. An electrostatic m-image forming method characterized by performing the following steps.