JPS59176748A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To obtain an electrophotographic sensitive body low in residual potential and stable in acceptance potential by forming an Se-Te halogen layer and an Se-Te layer on a conductive substrate. CONSTITUTION:The first evaporation source contg. 3-14wt% Se and Te and 2- 1,000ppm halogen and the second evaporation source contg. 3-25wt% Se and Te are arranged in a vacuum vessel, and the first evaporation source is heated to vapor deposit a 20-80mum thick Se-Te halogen layer 2 on a conductive substrate 1, and then, the second evaporation source is heated to vapor deposit a 2-10mum thick Se-Te layer 3 on the layer 2.

Description

[Detailed description of the invention] The present invention relates to the structure of an electrophotographic photoreceptor.

Conventionally, selenium (Se)-tellurium (
A photoreceptor provided with a Te)-halogen layer is known.

This photoreceptor has high sensitivity by adding Te to Se to extend the photosensitive wavelength to the long wavelength side, and also has T
Since e is added, printing durability is improved. Furthermore, 5e-T has a high residual potential due to the addition of halogen.
E-alloy glue points are eliminated. However, when this halogen-added photoreceptor is used for continuous copying in a copying machine, the charged potential of the photoreceptor gradually decreases as the number of copies increases, and as a result, the # degree of the copied image also decreases, making it unusable for practical use. This is difficult.

Table 1 shows how the charged potential gradually decreases after being left unused. That is, Table 1 shows that B is placed on an aluminum drum.
e (86% by weight) - T e (14% by weight) and 5
e (86 double puller) - Te (141E bond%) - chlorine (
30ppm) alloy, which shows the difference in properties when deposited under the same conditions.

(The amount of chlorine added is based on 100% before the sum of se, Q, and Te.) Table 1 ■: First charging potential in the copying machine ■. . : Band'WL potential VR after 500 repetitions in the copying machine. . : As can be seen from the table of residual potential after 500 repetitions in a copying machine, the residual potential is low in the 5e-Te-chlorine alloy, but the drop in charging potential is large at the rod end.

Further, when the Te concentration was measured from the support side to the surface of both photoreceptors, it was found that both photoreceptors had almost the same distribution. From these two facts, it was found that the cause of the large decrease in the a The addition of chlorine to the alloy lowers the resistivity of the 8e-Te alloy. As a result 5e
It is thought that in the photosensitive layer made of -Te-chlorine, a sufficient blocking layer for charge retention is not formed on the surface. The present invention has been made in consideration of the above points, and an object of the present invention is to obtain a photoreceptor having a low residual potential and a stable charging potential.

The present invention will be described above based on the drawings.

FIG. 1 shows a sectional view of an electrophotographic photosensitive material according to an embodiment of the present invention. In the figure, the material is a conductive support.
2 has a thickness of 20 to 804 m and is a first layer made of 5e-Te-halogen; 3 has a thickness of 2 to 10 μm and is a 5e-
This is the second layer made of Te. In this photoreceptor, the first 7
Appropriately, the Te concentration of the second layer 3 is 3 to 14%, and the Te concentration of the second layer 3 is 3 to 25%. If the Te concentration of the first layer 2 is less than 3%, the residual potential increases due to repetition, and if it is more than 14%, the resistance becomes too low and it becomes difficult to retain charge. If the Te concentration of the second layer 3 is less than 3%, the residual potential increases and only low sensitivity can be obtained.

On the other hand, if it exceeds 25%, dark decay may increase, which is undesirable. The thickness of the first layer 2 is 20 to 80 μm, and the thickness of the second layer 3
A suitable value is 2 to 10 βm. The thickness of the first layer 2 is 30j
If it is thinner than 1 m, the capacitance becomes large and the charging potential will not ride well, and if it is thicker than 804 m, the residual potential will increase. Moreover, if the thickness of the second layer 3 is thicker than 104 m, the residual potential increases due to repetition, and if it is thinner than 2 μm, there is little effect in preventing a decrease in the charging potential.

As the halogen, chlorine, iodine, fluorine, and bromine are used, and they mainly play the role of lowering the residual potential. The appropriate amount of halogen added is 2 to 11,000 pp;
If it is less than pm, there is no effect of lowering the residual potential (100
If the amount is more than 0 ppm, other electrical characteristics will deteriorate. (For example, increase in dark decay) In the present invention, the Te concentration of the second layer 3 does not necessarily have to be higher than the Te8 degree of the first layer 2, and it is important that the second layer 3 does not contain halogen. It is.

The photoreceptor of the present invention can be manufactured by the following method.

(1) Se-Te-halogen and Se-Te are placed in two separate evaporation sources. First, the evaporation source of 5e-Te-halogen is heated to deposit the first layer.After the completion of the evaporation, 8e
- The second layer is deposited on the first layer by heating the Te evaporator.

(2) Put Se-Te and Se-halogen into two separate evaporation sources. The two evaporation sources are heated and evaporated simultaneously, and the evaporation source for Se-halogen is set so that the evaporation ends earlier by a predetermined time.

This will be explained in detail below using examples.

<Example 1> Two evaporation sources made of stainless steel were prepared in a vacuum chamber, and the first evaporation source contained 8e (88% by weight) -Te (12% by weight) -
Add chlorine (100 ppm) and use 5e (78
%)-Te (22% by weight) was added. then 5 x
First, the first evaporation source was
A first layer having a thickness of 55 μm was formed on an aluminum drum heated to 00° C. and maintained at 70° C. Next, after the vapor deposition of the first evaporation source was completed, the second evaporation source was heated to 310° C. without breaking the vacuum to form a second layer having a thickness of 5 μm on the first layer, thereby obtaining a photoreceptor of the present invention.

On the other hand, for comparison, 8e (88% by weight) -T e (12
Weight %) - Only chlorine (100 ppm) was added to the evaporation source and 60 μm of chlorine was deposited on an aluminum drum under the same deposition conditions as before. These two photoreceptors were installed in a commercially available copying machine, the initial charging potential was set to 600 Å, and the results were repeated as shown in the second light. The two-layer structure photoreceptor of the present invention exhibited good characteristics, with a low residual potential and almost no decrease in charging potential due to repetition.

Second light VI: First charging potential VR# lle in the copying machine
'Residual potential after 500 repetitions in a 1Ji photocopier <Example 2> Two stainless steel evaporators were prepared in a vacuum chamber, and the first evaporator was 8e (90% by weight)-Te( Se-chlorine (300 ppm) was added to the second evaporation source. The first and second evaporation sources are set in advance so that when deposited alone, the evaporation speed and thickness shown in the second light are obtained.

The first and second evaporation sources are energized at the same time, and the first evaporation source is
℃, the second evaporation source was heated to 280° C., and evaporation was carried out for 21 minutes to obtain a 60 μm photosensitive layer on the aluminum drum. At this time, the surface of the aluminum drum was maintained at 70°C.

Since evaporation of the second evaporation source was completed at the time of 18 minutes, the photoreceptor thus obtained was the photoreceptor of the present invention consisting only of T e - T e in the thickness of 6 μm from the surface. This photoreceptor was installed in a copying machine in the same manner as above, the initial charging potential was set to 600V, and the process was repeated. The results were almost the same as those of the photoreceptor of the present invention in Example 1, and the characteristics were good.

As described above, the present invention has excellent charging potential stability,
Further, since a photoreceptor having a very low residual potential can be obtained, the practical effect is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a photoreceptor according to the present invention. 1 is a conductive support, 2 is a first layer (8e-Te-halogen layer), and 3 is a second layer (8e-TeN). Patent applicant Shindengen Kogyo Co., Ltd. Yamanashi Electronics Kogyo Co., Ltd.

Claims (1)

[Claims] A second layer consisting of selenium (Se), tellurium (Te), lxrogen (Se), and tellurium (Te) having a thickness of 20 μm to 30 μm is laminated on the conductive support, and the tellurium concentration in the first layer is laminated. A photoreceptor for electrophotography, characterized in that the tellurium concentration in the second layer is set at 3 to 14% by weight, and the tellurium concentration in the second layer is set at 3 to 25% by weight.