JPS59162558A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To reduce deterioration of potential in the dark during repeated uses and to maintain potential difference between the light and dark parts at the early stage by forming on a conductive substrate, a photosensitive charge transfer layer made of an Se layer, and a charge generating layer consisting of an Se-Te layer, an Se layer, and an Se-Te layer. CONSTITUTION:A charge transfer layer 11 of an Se layer and a charge generating layer 12 consisting of an Se-Te layer 13, an Se layer 14, and an Se-Te layer 15 are laminated on a conductive substrate 10. Such a layer 12 is complemented in sensitivity in the red region with the Te-added layer 13, and the layer 14 transmits carriers generated in the surface layer 15 to the layer 13, and also contributes to lowering of the resistivity of the layer 12. As a result, deterioration of potential during repeated uses is reduced, and the potential difference at the early stage is maintained, thus reducing deterioration of image density and change of color tone, and maintaining high sensitivity.

Description

[Detailed Description of the Invention] [Technical Field] What is the present invention? l! The present invention relates to a photoreceptor for secondary photography, particularly a photoreceptor for color electrophotography.

[Prior art]

FIG. 1 shows the structure of a conventional color electrophotographic photoreceptor. In the figure, 1 is an Al support, 2 is a Se layer (thickness 30~
100 μm), 3 is 5e-Tel! J (Te;
It is a photoreceptor with a two-layer structure consisting of 12 to 20 wt % and a thickness of 57 zm. With this photoreceptor, the dark area potential decreases by 50 to 120 cm after repeated copying of 20 to 50 sheets, which is a major cause of 1 image area decrease and color tone change. In order to prevent this drop, it is necessary to electrically change the bias voltage to compensate for the drop, but it does not always drop by the same amount, so it takes a certain amount of time after copying multiple pages. If you don't leave it, it won't recover to its original state. Immediately after the start of the next copy, the dark potential is 40 to 70.
It becomes V. This phenomenon has the disadvantage that it constantly changes depending on the fatigue state of the photoreceptor.

〔the purpose〕

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a highly sensitive photoreceptor that can maintain the initial bright-to-dark potential difference well with little decrease in dark area potential even after repeated use.

[Structure] The photoreceptor of the present invention includes a charge transport layer consisting of a Se layer on a conductive support, a 5e-Te layer, a Se layer, and a Se layer.
-Te layer is provided.

The structure of the electrophotographic photoreceptor according to the present invention will be explained with reference to FIG.

In the cough diagram, 10 is a conductive support, for example At. Se
Layer 11 is a charge transport layer with a thickness of 30 to 100 μD.
1. Preferably it is 40-60 μm.

As may be added in an amount of 0.5 to 2 wt% to prevent crystallization.

The charge generation layer f2 has a content of 10 to 20 wt%, preferably 15 to 25 w, in order to compensate for the sensitivity in the red region of 600 to 700 nm.
5e-Te layer 1 with a film thickness of 1 to 5 μm added with t% of Te
3, and the carriers generated on the surface layer are transferred to layer 13, 5e.
- Film thickness of 0°5 to 5 μm, preferably 0.5 to 2 μm, for transmitting to the T'e layer and preventing specific resistance of the charge generation layer.
μm Se layer 14 and 10 to 20 wt%, preferably 1
It consists of a 5e-Te layer 15 with a thickness of 0.5 to 2 μm to which 0 to 15 wt% of Te is added. Note that the layers 14 and 15
As may be added to prevent crystallization. In this case, 0.5 to 2 wt% of As is contained in one layer 14, and A is contained in layer 15.
s is added in an amount of 1 to 10 wt%.

Further, the Te concentration of the 13th layer is the same as the Te concentration of the 15th layer.
The concentration is more than nine added. The following is a detailed explanation based on Examples and Comparative Examples. The results are described in Example 2.

Se 1 with purity of 99.99% in P+tube boat for Se
'45 g.

S e T, S e of 1 to 2 mmφ on the e boat
Added 14.5g of Te alloy material and added 290g of Se layer.
52 μm at 330° C. for 50 minutes, and then a S e T'e layer was deposited at 5 gm at 330° C. for 6 minutes in a vacuum of 3×10” Torr. At this time, the Te concentration 2 was 16 W.
It was set as t%. The set temperature of the Al drum is 80°C.

Comparative Example-2 Se material was put into a cylindrical boat for Se in the same manner as in Comparative Example-1, and 5eTe (Te18wt%) 5 was put into a boat for 5eTe.
0g of Se in a vacuum of 3X101' Torr.
A 2 μm thick layer of 5eTe was deposited, and then a shutter provided on the 5eTe boat was operated to leave about 1/11 of the S e Te material in the boat, and a 2 μm thick 5eTe layer was deposited. The experimental results are shown in Table-1.

Example-1 A cylindrical boat for Se and 12 square boats for the 5eTe layer were placed in a vacuum evaporation apparatus, a shutter was placed on each boat, 160g of Se material was placed in the port for Se, and 30g was placed in the boat for 5eTe. (Te18wt%), Se on the boat ■
Add 30g of Te (12wt% of Te) to 3x105
Two shutters were operated in Torr so that the Se layer had a thickness of 50 μm, the power was turned off at the same time as the deposition was completed, and then the boat was energized, and the layer thickness was reduced to 1 μm by operating the shutters.
m, the Te concentration was set to 18 wt%. Then, the Se boat was energized again and the shutter was operated so that the Se layer was at lILm. Furthermore, by energizing the S e Te port 0 and operating the shutter, the S e Te layer becomes 1.
A photosensitive layer was deposited on the Al drum so that the T concentration was 14 wt%.

The film thickness and Te concentration of the photoreceptor were all controlled by vapor deposition time and boat current.

Example-2 Boat for SeTe (T e i1 degree 20wt% S in υ
eT e 6 g, Se Te material with a tea content of 12 wt% was introduced into the same port ■, and the Te concentration of the first layer was set to 20 wt.
% The same as Example 1 except that the Te concentration of the second layer was set to 13 wt %.

Each original density (I
Table 1 shows the change in surface potential in D).

〔effect〕

There is little potential drop during repeated use, and the initial bright-dark potential difference can be maintained. Therefore, a decrease in image density can be ignored and a change in color tone can be ignored. And it is highly sensitive.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional electrophotographic photoreceptor, and Fig. 2 is a sectional view of a conventional electrophotographic photoreceptor.
FIG. 1 is a cross-sectional view of an electrophotographic photoreceptor according to the present invention. IO: conductive support, 11: ffi charge transport layer, 12: charge generation layer. Patent applicant Ricoh Sai Co., Ltd. Figure 1 Figure 22

Claims (1)

[Claims] A charge transport layer consisting of a Se layer on the conductive support, and 5e
- An electrophotographic photoreceptor comprising a charge generation layer comprising a Te layer, a Se layer, and a 5e-Te layer.