JPH03156483A - Electrophotographic recording device - Google Patents

Abstract

PURPOSE:To prevent fine ruggedness from occurring on a photosensitive body by forming an exposing opposed plate of a material whose friction coefficient is smaller than that of metal or covering the surface of the exposing opposed plate with a material whose friction coefficient is smaller than that of metal. CONSTITUTION:The exposing opposed plate 11 is formed of the material whose friction coefficient is smaller than that of the metal or the surface of the plate 11 is covered with the material whose friction coefficient is smaller that of the metal. For instance, the plate 11 is set on the back side of the exposing position A of the belt-like photosensitive body 1 so that the film 12 of 'Teflon(R)' whose friction coefficient is small may come in contact with the metallic substrate of the belt-like photosensitive body 1. In such a case, the substrate of the photosensitive body 1 comes in contact with the film 12 of the plate 11 while performing a recording action, so that excess frictional force is prevented from occurring between the substrate of the photosensitive body 1 and the plate 11 at the exposing position A. Thus, the irregularity of the substrate of the photosensitive body 1 is restrained from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrophotographic recording device equipped with a belt-shaped photoreceptor, which is applied to facsimiles, printers, copying machines, and the like.

(Prior Art) Conventionally, as a belt-shaped photoreceptor, one in which an organic photoreceptor (OPC) is coated on a substrate such as an All-deposited resin and then ultrasonically fused to form an endless shape has been used. .

However, in recent years, belt-shaped photoreceptors with metallized substrates (Ni electroforming) are being developed.

FIG. 3 is a configuration diagram showing a conventional electrophotographic recording apparatus, in which 1 is a belt-shaped photoreceptor whose substrate is made of a metal material, and 2 is a photoreceptor installed on the back surface of the exposure position A of the photoreceptor 1. 1 is a metal exposure facing plate in contact with the substrate 1; 3, 4, and 5 are support rollers for the photoreceptor 1; 6 is a developing device; 7 is a transfer device; 8 is a cleaning device; 9 is a static elimination lamp; 10 is a charging device. It is a vessel.

In the figure, a belt-shaped photoreceptor 1 has a support roller 3,
The belt-shaped photosensitive material is first rotated while being supported by #4. An exposure counter plate 2 is provided in order to achieve positional accuracy of the exposure image of the body 1.

The latent image recorded on the photoreceptor 1 is developed with toner by a developing device 6, transferred to a transfer paper by a transfer device 7, and then fixed to the transfer paper by a fixing device (not shown). After the above-mentioned transfer operation, the surface of the photoreceptor 1 is cleaned by removing residual toner with a cleaning device 8, and further, the electric charge is removed with a discharge lamp 9.

(Problems to be Solved by the Invention) In the above-mentioned conventional apparatus, when the belt-shaped photoreceptor 1 is repeatedly used, minute irregularities called "pruning" occur on the metal substrate of the photoreceptor 1. I understand. These irregularities pose no problem when forming a binary image, but they cause an abnormal image when forming a halftone image.

The unevenness may be caused by excessive frictional force generated between the metal exposure facing plate 2 and the metal substrate of the photoreceptor 1, or may be caused by unevenness on the surface of the exposure facing plate 2.
Alternatively, microscopic stress concentration occurs on the substrate of the photoreceptor 1 due to unevenness caused by foreign matter adhering to the surface of the exposure facing plate 2, resulting in metal fatigue. It has been found.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic recording apparatus that can prevent minute irregularities from occurring on a belt-shaped photoreceptor whose substrate is a metal.

(Means for Solving the Problems) In an electrophotographic recording apparatus including a belt-shaped photoreceptor whose substrate is a metal, and an exposure opposing plate that is RIM'd on the back surface of the photoreceptor at the exposure position and contacts the photoreceptor, The exposure counter plate is made of a material having a lower coefficient of friction than metal, or the surface of the exposure counter plate is coated with a material having a lower friction coefficient than metal, and the exposure counter plate is made of an elastic material. Alternatively, the surface of the exposure facing plate is coated with an elastic material.

(Function) By employing the above means, the friction between the exposure facing plate and the photoreceptor substrate is reduced, so that excessive frictional force is not applied to the photoreceptor substrate, preventing the occurrence of irregularities on the substrate, and The unevenness that occurs between the exposure facing plate and the substrate of the photoreceptor is absorbed by the deformation of the elastic body, so that concentrated stress does not occur, and the occurrence of unevenness on the substrate can be prevented.

(Example) An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a configuration diagram showing an embodiment of an electrophotographic recording apparatus of the present invention, and FIG. 2 is a perspective view showing an exposure opposing plate in the embodiment of FIG. Corresponding members are denoted by the same reference numerals, 11 is an exposure counter plate, 12 is
The surface of the exposure facing plate 11 is covered with a film made of a material having a coefficient of friction smaller than that of metal, such as a film of Teflon (trade name).

In FIG. 1, the exposure position I of the photoreceptor 1 is set such that the Teflon film 12 with a small friction coefficient is in contact with the metal substrate of the belt-shaped photoreceptor 1! An exposure opposing plate 11 is installed on the back surface of A.

Therefore, during the recording operation described in the conventional example of FIG. It is possible to prevent excessive frictional force from being generated between the photoreceptor 1 and the photoreceptor 1, and as a result, it is possible to suppress the occurrence of unevenness on the substrate of the photoreceptor 1.

Note that the entire exposure counter plate 11 may be resin-molded from nylon or Teflon, which has a coefficient of friction smaller than that of metal, and furthermore, the back surface of the metal substrate of the counter plate IL may be coated with a material having a coefficient of friction smaller than metal (for example, polyimide mylar).
It is also possible to paste.

Further, the surface of the exposure facing plate 11 is flocked or rubber is pasted, and the surface of the exposed facing plate 11 is covered with a flocked body or an elastic plate such as rubber, and this elastic body is attached to the substrate of the photoreceptor 1. By making it tangential.

Since the elastic body 1 is deformed to prevent unevenness between the substrate of the photoreceptor 1 and the exposure facing plate 11, concentrated stress is not applied to the substrate of the photoreceptor 1, and the substrate of the photoreceptor 1 is Metal fatigue can be prevented, and the occurrence of irregularities on the substrate of the photoreceptor 1 can be suppressed.

Further, the entire surface of the exposure counter plate 11 may be formed of an elastic material without covering the surface of the exposure counter plate 11 with an elastic material.

(Effects of the Invention) According to the present invention, it is possible to prevent excessive frictional force or concentrated stress from occurring between the metal substrate of the photoreceptor and the exposure facing plate, and therefore, the metal substrate of the photoreceptor can be prevented from being generated. It is possible to provide an electrophotographic recording device that can suppress the occurrence of minute irregularities on the substrate.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of an electrophotographic recording apparatus according to the present invention, FIG. 2 is a perspective view showing the exposure opposing plate of FIG. 1,
FIG. 3 is a block diagram showing a conventional electrophotographic recording apparatus. 1...Photoreceptor, 3,4.5...Support roller,
6...Developer, 7...Transfer device. 8... Cleaning device, 9... Static elimination lamp,
IO... Charger, 11... Exposure opposing plate. 12... Film made of material with a small coefficient of friction, A... Exposure position. Figure 1... 6... 8... 10... 12... A... Photoreceptor 3, 4.5... Moxibustion roller nine images B
7...Transfer device cleaning b
9... P# Tun Lampf. f tonden 11...Kamekuba 說誼頴 1 ne &'s small (゛ wo 1 now Tenta crisis busibe 1

Claims (2)

[Claims] (1) In an electrophotographic recording apparatus equipped with a belt-shaped photoreceptor whose substrate is a metal, and an exposure opposing plate installed on the back side of the photoreceptor at the exposure position and in contact with the photoreceptor, the exposure opposing plate is made of metal. 1. An electrophotographic recording device characterized in that it is formed of a material having a lower coefficient of friction than metal, or the surface of an exposure facing plate is coated with a material having a lower coefficient of friction than metal. (2) In an electrophotographic recording device equipped with a belt-shaped photoreceptor whose substrate is a metal, and an exposure opposing plate installed on the back side of the photoreceptor at the exposure position and in contact with the photoreceptor, the exposure opposing plate is made of an elastic material. 1. An electrophotographic recording apparatus characterized in that the surface of an exposure facing plate is covered with an elastic body.