JPS63235947A - Photoconductive member - Google Patents

Abstract

PURPOSE:To prevent the titled member from peeling and breaking of an a-Si film by attaching a reinforcing material to both ends of the inner circumferential surface of a supporting body drum which is formed the amorphous silicon (a-Si) film on the outer circumferential surface of said drum, thereby suppressing the deformation of the drum at the time of heating it. CONSTITUTION:The titled member is provided with the supporting body drum 10 formed the a-Si film on the outer circumferential surface 10b and the reinforcing material 12 which reinforces the supporting drum 10 by attaching to at least both ends of the inner circumferential surface 10a of said drum 10. Therefore, the strength of both ends of the drum 10 which is easy to deform by mostly affecting at the time of heating the drum at a high temperature, in the formation of the a-Si film, is increased. Thus, the deformation of the supporting body drum 10 is suppressed, even when that the wall thickness of said drum 10 is thin, whereby the peeling and the breaking of the a-Si film generated by the deformation of the drum are prevented, and the production cost of the titled member is reduced by making the wall thickness of said drum 10 thin.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industry> Second Field of Application The present invention relates to a photoconductive member used in electrophotography, document reading devices, and the like.

<Prior art> Conventionally, photoconductive layers of photoconductive members used in electrophotography, etc. are made of inorganic photoconductive materials such as Se, CdS, and ZnO, or PVK-T.
It was composed of photosensitive materials such as organic photoconductive materials such as NF. These materials have the photosensitivity, spectral properties, and S/N ratio (bright resistance/dark resistance) required for photoconductive materials.
However, there is a problem in that the durability and safety of the human body are unsatisfactory, and that they must be used depending on individual circumstances under certain conditions.

Therefore, in recent years, amorphous silicon (hereinafter referred to as A-81), which has advantages such as high photosensitivity, high durability, and non-pollution, has been attracting attention as a material that overcomes the drawbacks of the above-mentioned photoconductive materials. Active research and development is underway. FIG. 4 shows one of the conventional photoconductive members in which a photoconductive layer is formed using this a-8i. This photoconductive member is
A drum flange (
The support tram 1 has a single load 2 for attaching the support tram 1 (not shown), and a film 1bl:a-3i is formed on the outer circumferential surface of the support tram 1.

<Problems to be solved by the invention> In order to provide a photoconductive member with good conductive properties, a-
When forming the 9i film, it is necessary to heat the support drum 1 to 200° C. or higher.

However, the support tram 1 and the a-9i membrane have different coefficients of thermal expansion, and the a-8i membrane has a large internal stress, so that the a-8i membrane is supported depending on the degree of thermal deformation of the support drum. There is a problem that the film may peel off from the body drum 1 or the film may crack.

For this reason, peeling and cracking of the a-8i membrane have been dealt with by increasing the thickness of the support tram I to deform the support drum I. However, if the thickness of the support tram 1 is made thicker, additional monthly costs will increase, which is a big problem when mass-producing the A-8IT' ram.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to form an a-9i film even in a thin support drum without deforming the support drum, and to prevent the a-81 film from deforming the support drum.
In addition to preventing film peeling and film cracking, manufacturing costs can be reduced by making the support drum thinner.
4.

In order to achieve this goal, the photoconductive member of the present invention includes a support drum on which an a-3i film is formed on the outer circumferential surface, and an inner layer of the support tiger J3. The biped support tram is provided with reinforcement members attached to at least both ends of the circumferential surface to reinforce the bipedal support tram.

<Function> The support drum is reinforced by the reinforcing material placed on the inner circumferential surface of the support drum. This suppresses the deformation of the support tram during heating and improves the a-3i membrane. Peeling and membrane cracking should be prevented.Additionally, the reinforcing material allows the support drum to be made thinner.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a sectional view showing an embodiment of the present invention, in which 10 is a support tram, 12 is an inner circumferential surface 10 of a support drum IO.
This is a reinforcing material that is cut out at both ends of a as shown in Fig. 2. The ends of the support drum are the parts most susceptible to deformation. The bipedal support drum 10 is made of aluminum with good surface smoothness and easy temperature control, and the hli reinforcement 12 is made of stainless steel, which has a lower coefficient of thermal expansion and greater mechanical strength than aluminum. .

” The outer circumferential surface 10b of the bipedal support drum 10 is coated with three layers of the first, second and third layers using the P-CVD method (plasma chemical vapor deposition method) under the conditions shown in Table 1 below. a- consisting of layers
3i film (not shown) is formed.

FIG. 3 of Table 1 is a sectional view showing a modification of the two-legged embodiment, in which a stainless steel reinforcing material 14 is inserted over the entire inner peripheral surface lOa of the support drum 10 similar to the two-legged embodiment. Then, in the same manner as in the above embodiment, the outer circumferential surface 10b1 of the support tiger J210. : A-8i film is formed in three layers.

'' The film peeling and film tearing of the photoconductive members (Nos., I to 4) of this example having a two-leg structure were observed. Then, these photoconductive members were placed in a copying machine, images were printed, and the images were evaluated. On the other hand, an a-5i film was formed on the conventional photoconductive member marked "-" under the conditions shown in Table 1 in the same manner as in this example, and as a comparative example (No. 5°6), film peeling and film cracking were observed. After observing the situation, image evaluation was performed in the same manner as in this example. The results are shown in Table 2 below.

Table 2 * There are two problems: ◎・Very good, ○: Good, ×: Practical.

Note: The number of membrane peelings is per one support tram.

The results shown in Table 2 of ``-'' As is clear, a lot of film peeling was observed in all of the comparative examples (No. 5.6).'' 2. The image evaluation was also unsatisfactory.

On the other hand, among the present embodiments, Nos. 1 and 2, in which the reinforcing material 12 was inserted only at the end of the inner circumferential surface 10a of the support drum 10,
In the case of , even though the sum of the support drum wall thickness and the hli reinforcement wall thickness was 4 mm, which is the same as comparative example No. 6, only one film peeled off, there was no film cracking, and the image evaluation was good. there were. In particular, although the support drums of No. I of this example and No. 5 of comparative example had the same wall thickness of 3 mm, the difference between the two was obvious, indicating that the reinforcing material was effective. This is clearly shown. Furthermore, in the case of No. 3.4, in which the reinforcing material is inserted into the entire inner peripheral surface of the support drum, even though the total thickness of the support and the reinforcing material is 3 mm, which is the same as the comparative example No. 095. Good results were obtained, with no film peeling, no film cracking, and very good image evaluation. The above results indicate that it is possible to further reduce the thickness of the support drum depending on the thickness of the reinforcing material.

From the above results, if the reinforcing material 12 or 14 is inserted into the inner peripheral surface 10a of the support drum 10 to reinforce the support drum 10 as in this embodiment, the strength of the support drum 10 can be increased. It becomes difficult to deform even when heated above 200°C, and even if the thickness of the support drum 10 is made very thin, by adjusting the thickness of the reinforcing material, the a-8
It can be concluded that peeling and cracking of the i-film can be prevented.

Furthermore, according to this embodiment, the wall thickness of the support drum IO can be made thinner, so manufacturing costs can be reduced, and since the reinforcing material is made of durable stainless steel, durability can be improved. good.

In addition, in the two-leg example, the formation of the a-8i film was performed by P-CVD.
Although the method was used, a sputtering method or other known methods may also be used.

<Effects of the Invention> As is clear from the above, according to the present invention, reinforcing materials for reinforcing the support tram are attached to at least both ends of the inner peripheral surface of the support drum. It is possible to increase the strength of both ends of the support drum, which are most susceptible to deformation during high-temperature heating during forming (J). Therefore, even if the support drum is thin, the support drum The deformation of the support drum can be suppressed, and peeling and cracking of the A-8I film caused by the deformation of the support drum can be prevented.In addition, the thickness of the support drum can be reduced, reducing manufacturing costs. Can be reduced.

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[Brief explanation of drawings]

1 and 2 are a cross-sectional view and a plan view showing an embodiment of the present invention, respectively, FIG. 3 is a cross-sectional view showing a modification of the present invention, and FIG. 4 is a cross-sectional view of a conventional example. 1.10 Support drum, I 2,1 /I Reinforcement material.

Claims (1)

[Claims] (1) A photoconductive member comprising: a support drum having an amorphous silicon film formed on its outer peripheral surface; and reinforcing materials attached to at least both ends of the inner peripheral surface of the support drum to reinforce the support drum.