JPS5831344A - Electrophotographic receptor - Google Patents

Abstract

PURPOSE:To obtain a photoreceptor capable of fixing, hardening, and stabilizing a photsensitive material to and on the surface of a cylinder with heat produced by supplying electric current through a lower layer. CONSTITUTION:The surface layer 1 of a cylinder is formed by using a conductive resin having 1-10<3>OMEGA electric resistivity, obtained by dispersing carbon powder into a curable type phenol resin, or the like, and under this layer, an insulating layer 2 having 10<7>-10<9>OMEGA resistivity is formed using bakelite, acrylic resin, polyethylene, or the like, and under this layer a lower layer 3 is formed using a conductive resin having 10<1>-10<4>OMEGA resistivity, and electrodes 4 are incorporated with this layer 3. A photosensitive material is coated on the cylinder thus formed, voltage is applied to the electrodes 4 to supply current through the layer 3. The photosensitive material is hardened with heat produced by the current to form a photosensitive layer, and when needed, an insulating layer is formed to obtain an intended electrophotographic receptor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic photoreceptor, particularly a three-layer resin cylinder composed of both conductive and insulating resins. The present invention relates to an electrophotographic photoreceptor in which the photoreceptor is attached to the cylinder surface by generating heat and using the heat to stabilize the environment of the photoreceptor.

Conventionally, there are two types of photosensitive drum cylinders: a metal cylinder and a conductive resin cylinder.
The specularity of the cylinder surface, which is important for high precision, especially for photoreceptor coating, is 0.2 tones R11! 4 can be obtained at high speed and at low cost, which is advantageous.

However, since it is made of resin, it has poor heat conduction, and conventional external heating type drum heaters have a dangerous problem in that they do not have sufficient environmental stabilization effects to keep up with the temperature.

The present invention advantageously solves the above-mentioned difficulties, and provides a photoreceptor Ks that includes a support and a photoconductive layer, or further an insulating layer. The surface of this support has an electrical resistance of 1 to 101
The lower layer is made of a conductive resin with an electrical resistance of 10 to 10 Ω, with an electrical insulating layer having a resistance of 1 G' to 109 Ω sandwiched thereunder, and an electrode is incorporated in the lower layer of the bracket. This is an electrophotographic photoreceptor characterized by:

That is, the present invention has a structure in which a conductive resin cylinder is divided into two by an insulating resin layer to have a three-layer structure, and an electrode is built into the lower layer and this layer is made to generate heat by directly passing a current through it. Since the photosensitive layer is heated from the temperature of the cylinder configured in this way, thermal efficiency is greatly improved,
This allows the photosensitive layer to be easily stabilized in the environment.

At the same time, in one photoconductor manufacturing process, when a photosensitive agent dispersed in a binder is applied to the cylinder surface Wi and thermally cured, this process, which was conventionally carried out in a heating drying oven, is
It is now possible to process by simply energizing the cylinder without the need for a drying oven. Moreover, by this method, curing proceeds from the inside rather than from the surface, and the amount of residual solvent is greatly reduced, resulting in a photosensitive layer with favorable characteristics.

In the present invention, the electrical resistance of the 11-layer photosensitive layer must be 100 or less in order to reliably inject charge into the photosensitive layer, and this layer must be grounded and constantly maintained at Ov. For this reason, a layer is provided to electrically insulate between the lower layer (heater layer) which is heated by electricity.

Is there car in the surface layer and bottom layer? For the insulating layer, bakelite, acrylic resin, polystyrene, or in some cases, insulating paints such as 1-livinyl formal, 1-liurethane, and silicone resin can be used.

The present invention will be explained in detail below using examples.

Figure 1~#! Figure 2 is a diagram showing an example photoreceptor of the present invention.
1 is the surface layer where the photosensitive material is placed, and has an electrical resistance of lXl0
Ω or less, 2 is an insulating layer that separates the surface conductive layer and the lower layer, 3 is the lower conductive layer that serves as a heater and has a resistance of 10 to 10 Ω, 4 is for uniformly flowing current through the lower layer. This is the electrode.

In the above configuration, when a voltage is applied from the electrode 4tC7 to the socket, a current flows through the lower layer 3 and generates heat.

This heat is used for the manufacturing coating process and for environmental stabilization of the photoreceptor.

Some photoreceptors do not require environmental stabilization by heating the drum/glue, and for those, the resistance of the lower layer is made the same as that of the surface layer, and only the advantages in the manufacturing process are obtained. It is also possible to obtain.

In this case, the cost of the cylinder is further reduced, and the temperature of the cylinder increases quickly by applying a large amount of electric power, which is advantageous in manufacturing.

As explained above, by putting one insulating layer in a conductive resin cylinder, one layer can be used as a photoreceptor substrate and the other layer can be used as a heater, and the manufacturing process can be simplified and the characteristics of the photoreceptor can be improved at the same time. This will bring about beneficial effects.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of a resin cylinder according to an embodiment of the present invention, and Figure 2 is a cross-sectional view of the same. 1: Surface layer 2: Insulating layer 3: Lower conductive layer.

Claims (1)

[Scope of Claims] 16 A photoreceptor comprising a support and a photoconductive layer, or further an insulating layer, wherein the support has a surface resistance of 1 to 1.
080 layer, resistance 10-10 underneath? Ω electrical insulation layer,
An electrophotographic photoreceptor characterized in that the lower layer is formed of a conductive resin with an electrical resistance of 10' to 10 QO, and an electrode is incorporated in the lower layer. 1. The electrophotographic photoreceptor according to claim 1, wherein the surface layer polymer/hardening type phenolic resin is IfII mold. 1. Claim S characterized in that the material of the electrically insulating layer is Bakelite, acrylic resin, and -listyrene.
The electrophotographic photoreceptor described in No. 1Xji.