JPS63274961A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To prevent generation of fogging by interposing a thin layer of a specific alloy between a photosensitive layer consisting of a prescribed material and substrate. CONSTITUTION:A boundary layer 2 which is the thin layer of the selenium- tellurium alloy contg. >=15% tellurium is interposed in the boundary face between the conductive substrate 1 of the electrophotographic sensitive body and an electric charge transfer layer 3 forming the photosensitive layer. Injection of holes from the substrate 1 side is accelerated by this constitution, by which the negative charge potential of the substrate 1 at the time of negative electrostatic charge for the purpose of transfer of a toner having a positive charge is lowered and the fogging in the inter-paper part is weakened. The generation of the fogging is thus substantially prevented and a high-quality image is formed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention develops an electrostatic latent image formed by irradiation with light by adsorbing a positively charged toner, and then transfers this toner onto paper. The present invention relates to an electrophotographic photoreceptor that forms images.

[Conventional technology]

Most positive charging type printers, such as laser printers and light emitting diode printers that apply electrophotography, are high-speed printers that apply positively charged toner to the low surface potential area of the photoreceptor that is irradiated with light. This is a negative/positive transfer method that transfers this onto paper. Negative corona discharge (hereinafter referred to as negative charging) is used to transfer toner onto paper using this method.

[Problem that the invention seeks to solve]

In the amorphous selenium alloy photosensitive layer formed by vapor deposition of -m, the negative charges generated on the entire surface of the photoreceptor due to the negative charging described above are difficult to attenuate due to low electron mobility. As a result, when cut paper is used as printer paper, the area without paper is more efficiently charged negatively than the area with paper until the next paper arrives, and the negative charge is less than that of the area with paper. It will get higher and the next positive corona will be released! Even if the positive charge caused by (positive charge) is canceled and no light is irradiated, the potential becomes low, resulting in a thinly developed fog on the image.The higher the negative charge, the more clearly this appears on the image. It's coming.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic photoreceptor that solves these problems and prevents blurring that occurs in highly negatively charged areas between sheets.

[Means for solving problems]

In order to achieve the above object, the present invention provides Te1 at the interface between a photosensitive layer made of a selenium-based material and a conductive substrate.
A thin layer made of Se--Te alloy containing 5% or more is interposed.

[Effect]

The interface layer of the 5s-Te alloy containing 25% or more of Te improves the injection of holes from the substrate, accelerates the attenuation of the negative charge generated on the surface of the photoreceptor due to negative charging, and reduces the density between the sheets. Same concentration as normal. This interface layer also has the effect of canceling out variations in the surface treatment state of the substrate.

〔Example〕

FIG. 1 shows a cross-sectional structure of an embodiment of the present invention, which includes an aluminum substrate 1, a charge transport layer 3 made of pure Se and having a thickness of 47±2-. As you go upwards, Te1 degree increases 45
and a photosensitive layer constituted by a charge generating layer 4 of 0,6-thickness made of a 5e-Te alloy of up to 6% by weight and a protective layer 5 of 2μ thick made of a 5e-Te alloy of 6% by weight of Te. An interface layer 2 is interposed therebetween. The aluminum base 1 of this functionally separated multilayer structure photoreceptor has a diameter of 80 m.
, a length of 287 mm, and one having a surface ground by a grindstone and the other having a surface cut by a cutting tool were used. As the interface layer 2, pure 5130! +5eOz containing 200ppm Se+Se-Te containing 25% To
Four types of Se--Te alloys containing 45% Te were formed by vapor deposition in a vacuum of about 2 x 10-' Torr, and the same T4 transport layer 3. A charge generation layer 4 was formed under the same conditions, and a protective layer 5 was further formed by flash vapor deposition. The substrate temperature during the formation of each layer was kept constant at 58°C.

The results of measuring the negative charging potential of each of the photoreceptors manufactured in this manner by negative charging using a constant current power source with a current of 30 μ flowing into the substrate alone are shown in FIG. 2. Line 22 shows the case where a tool-cut finished substrate is used. The peripheral speed of the photoreceptor at the time of measurement was 28.6 rpm,
The angle between the charger and the potential measurement position is 27°.

From Figure 2, 5e-T containing 25% and 45% Te
It is recognized that by providing the e-alloy interface layer, the negative charging potential of the substrate can be suppressed to 100 V or less, and variations due to differences in substrate surface treatment can also be reduced. Such an effect was found by the interposition of an interfacial layer of Ss-Te alloy containing 15% or more of Te. Note that even with the interposition of the interface layer, no deterioration in photoreceptor properties such as a decrease in charging or an increase in residual potential was observed.

〔Effect of the invention〕

According to the present invention, 5e-T is provided between the selenium photosensitive layer and the substrate.
By interposing an interfacial layer made of e-alloy, the injection of holes from the substrate side is promoted, and the negative charging potential of the substrate during negative charging for transfer of positively charged toner is lowered. It is possible to reduce fogging in the intermediate portions, and to obtain an electrophotographic photoreceptor with fewer image defects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of an embodiment of the present invention, and FIG. 2 is a diagram showing the negative charging characteristics of the photoreceptor of the embodiment of the invention and the photoreceptor of a comparative example. Substrate, 2: Interface layer, 3: Charge transport layer, 4: Figure 1 Figure 2

Claims (1)

[Claims] 1) A photoreceptor for electrophotography, characterized in that a thin layer made of a selenium-tellurium alloy containing 15% or more of tellurium is interposed at the interface between a photosensitive layer made of a selenium-based material and a conductive substrate.