JPH03503810A - electrophotographic image carrier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] electrophotographic image carrier Technical field This invention relates to electrophotography, and more particularly to electroreciprocal image carriers.

prior art In this technique, a metal substrate having an intermediate layer applied with crystalline selenium; a photoconductive layer of glassy selenium applied to an intermediate layer; carrier is known (SU, A, No. 777633).

This known electrophotographic image carrier has low stability of the photoelectric parameters of the selenium layer; The crystallization ability of the photoconductive layer is high due to the presence of the intermediate layer made of crystalline selenium. is extremely difficult to remove at the end of its life, and the metal substrate is It has the disadvantage that it cannot be reused without mechanical treatment.

The technology includes a metal substrate, a photoconductive layer disposed between the metal substrate and the photoconductive layer, and , a material that impedes the propagation of crystallization from a metal substrate, and whose adhesion with the photoconductive layer an intermediate photoconductive stabilizing layer formed from a material, which is stronger in nature than that with a metallic substrate; An electrophotographic image carrier is known (SU, A, No. 1191877).

Two known electrophotographic image carriers are characterized in that a highly finished bearing surface of a metal substrate is Defects such as dents, nicks, scratches, and other mechanical or metallurgical defects The disadvantage is that very high requirements must be met regarding Ru.

The metal substrate of known electrophotographic image carriers, when exposed to mechanical factors, It is extremely sensitive, has a short lifespan, and recovery involves painstaking work. Ru.

This metal substrate cannot be repaired.

Disclosure of invention SUMMARY OF THE INVENTION It is an object of this invention to provide an electrophotographic image carrier member which has the required surface characteristics of a metal substrate. For the manufacture of electrophotographic image carriers, at the same time finishing conditions can be achieved substantially reduced material costs, long service life and good maintainability of the metal substrate , simplifying the manufacturing process and resulting in high stability of the photoelectric parameters of the photoconductive layer. The object of the present invention is to provide materials that guarantee quality and long life of electrophotographic image carriers.

This problem consists of a metal substrate, a photoconductive layer, and a medium electrically coupled to the photoconductive layer. According to the present invention, an electrophotographic image carrier comprising an electrically conductive stabilizing layer formed of a heat-resistant polymer - an elastic layer formed from a material and placed between the metal substrate and the conductive layer It has also been applied to a metal substrate, and the stable temperature of this polymer 41 material is photoconductive. During the transition of the material of the layer to an amorphous state, the elasticity is higher than the surface temperature of the metal substrate. This problem can be solved by providing a sexual layer.

Preferably, the elastic layer formed from a heat resistant polymeric material is rendered electrically conductive.

An elastic layer made of a heat-resistant polymeric material has the same width as the exposed area of the electrophotographic image carrier. and the electrical connection of the conductive layer with the metal substrate covers the exposed area of the electrophotographic image carrier. It can be done directly at an extra-regional site.

The polymer material of the elastic layer can be polyurethane.

The polymeric material of the elastic layer can also be polyamide.

The polymeric material of the elastic layer can be a polymeric arylate.

The polymeric material can be cellulose, ether.

This invention provides several advantages. An elastic layer made of a heat-resistant polymer material is By introducing the secondary photographic image carrier, aluminum, which is always in short supply, The consumption of aluminum round billets is greatly reduced and the metal base before applying the photoconductive layer is The amount of work in body surface pretreatment operations can be reduced. No chemical treatment required Therefore, the mechanical treatment of the surface of the metal substrate is reduced, and the metal substrate is resistant to mechanical damage. It has more stability, its lifespan is longer, it is easier to repair, and metal The substrate is easily manufactured and the photoconductive layer is attached to the metal substrate after the completion of its service period. Easily removed for body reuse, the photoelectric parameters of the photoconductive layer are more stable and the overall life of the electrophotographic image carrier is increased.

Brief description of the drawing The invention will be explained in more detail by means of specific embodiments thereof and with reference to the drawings.

FIG. 1 shows an elastic layer comprising an electrically conductive, heat-resistant polymeric material according to the invention. A longitudinal cross-sectional view of an electrophotographic image carrier, characterized in that: FIG. 2 shows the feature of the present invention comprising an elastic layer made of a heat-resistant polymer material. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION The electrophotographic image carrier consists of a metal substrate 1 (Figure 1), a heat resistant and conductive polymeric material. an elastic layer 2 applied to the metal base 1, and a conductive layer disposed on the elastic layer 2. an electrically conductive intermediate stabilizing layer 3; a photoconductive layer 4 disposed on the intermediate electrically conductive stabilizing layer 3; configured.

The photoconductive layer 4 is formed, for example, from vitreous selenium doped with oxygen. . The intermediate conductive stabilizing layer 3 is made of tin, for example, and is coated with the photoconductive layer 4. It has strong adhesive properties.

The tin atoms introduced into the photoconductive layer 4 made of selenium contribute to the formation of intermolecular cross bonds. Along with contributing, this results in high stability of photoelectric parameters and normal and high working temperatures. Provides a long service life for electrophotographic image carriers.

The elastic layer 2 is formed, for example, from a heat-resistant conductive polymer material. this Currently, common conductive polymers can be used as polymer materials. Ru.

The elastic layer 2 is applied on the carrier surface of the metal substrate 1 .

In Figure 2, the electrophotographic image carrier has a width equal to the exposure area of the carrier. It is characterized by having an elastic layer 2 made of a heat-resistant polymer material, and here, , the conductive layer 3 is connected to the metal substrate in a portion 5 located outside the exposed area of the image carrier. 1 and is directly electrically connected to 1.

By applying the elastic layer 2 to the metal substrate 1, Ra- It becomes possible to achieve a surface finish equal to 0.01 micrometers. this describes the operations necessary to prepare the surface of the metal substrate before applying the conductive and photoconductive layers 3 and 4. to omit work.

By using the elastic layer 2, mechanical flaws and metallurgical defects can be removed, Furthermore, crystal formation (neclei) on the surface of the metal substrate 1 can be eliminated. , resulting in improved optoelectronic parameters and a longer lifetime of the layer 4.

The geometrical dimensions of the metal substrate 1 vary beyond the tolerances established for these dimensions. In case of movement, such dimensions can be restored by application of the elastic layer 2.

If a used or damaged photoconductive layer 4 is to be replaced, the electrophotographic image carrier A is heated to a specific temperature.

Therefore, in order to replace the photoconductive layer 4 made of vitreous selenium, for example, The electrophotographic image carrier is heated to a temperature of 80-90°C. Set within this temperature range. A polymorphic transition of ren occurs, and its density and coefficient of linear expansion change independently. The result As a result, the composition consisting of the photoconductive layer 4 and the conductive layer 3 is destroyed, and this composition becomes elastic. Separate from the surface of layer 2. The substrate thus produces a new electrophotographic image carrier. can be reused for

When the photoconductive layer has completed its life and has to be removed, an elastic layer 2 is formed. Various solvents may be utilized depending on the type of polymeric material being used.

The following examples are provided for a better understanding of this invention and for different types of electrophotographic image carriers. An electrophotographic image carrier member for a copier, given for purposes of illustration, has a 260+ um Al having a length and a surface finish of Ra = 0.63 micrometers. Metal substrate made of aluminum alloy, polyethylene butylene-glycol adibate An elastic layer made of heat-resistant polyurethane based on made of tin with a width of 250 mm and a thickness of 3 micrometers. said bullet equal to the width of the exposed area of an electrophotographic image carrier also comprising an electrically conductive stabilizing layer. photoconductive layer made of selenium and its alloys with a thickness of 53 micrometers. It consists of layers.

The thermal stability temperature of polyurethane is 230°C, and the temperature of the surface of the metal substrate is 170°C. The transition temperature of the material of the photoconductive layer to an amorphous state is 120°C.

Example 2 The electrophotographic image carrier for a copier has a length of 300+u and has a Ra-0,2 a metal substrate consisting of an aluminum alloy with a surface finish of 5 micrometers, 5 It has a wall thickness of 0 micrometers and a width of 290+s, equal to the width of the exposed area. , from polymer arylates based on phenylenediamine and phthalic acid. made of tin, with a wall thickness of 5 micrometers and a width of 300 mm. an intermediate conductive layer consisting of selenium, with a wall thickness of 60 micrometers. A photoconductive layer.

The thermal stability temperature of the polymer arylate is 290°C, and the temperature of the metal substrate is 90°C. The transition temperature of the material of the photoconductive layer to the amorphous state is 85°C.

Example 3 The electrophotographic image carrier member for a copying machine has a length of 288 mm and has a Ra-0 , a metal substrate made of aluminum alloy with a surface finish of 63 micrometers. , a polymer arylate with a wall thickness of 25 micrometers and a width of 270 mm. an elastic layer made of tin, having a wall thickness of 5 micrometers and a width of 288 mm. an intermediate electrically conductive stabilizing layer consisting of selenium with a wall thickness of 80 micrometers A photoconductive layer consisting of

The thermal stability temperature of the polymer arylate is -210°C, and the temperature of the metal substrate is -85°C. The transition temperature of the material of the photoconductive layer to the amorphous state is -85°C.

Example 4 The electrophotographic image carrier member for a copier has a length of 400+n and a Ra-0 A metal substrate made of aluminum alloy with a surface finish of .01 micrometers. , with a wall thickness of 20 micrometers and a width of 390+n equal to the width of the exposed area. Elastic layer made of methyl cellulose (water soluble) with a wall thickness of 3 micrometers and and an intermediate conductive stabilizing layer of tin with a width of 400 fins and 68 mics. The photoconductive layer is made of selenium and has a wall thickness of 1.

The thermal stability temperature of methylcellulose is -120℃, and the temperature of the metal substrate is 85℃. The transition temperature of the material of the photoconductive layer to the amorphous state is -85°C.

The foregoing discussion shows that the electrophotographic image carrier member proposed herein has multiple advantages. This means that the lifetime of the metal substrate is extended and its maintenance Improved maintainability and ease of manufacture. This invention provides a photoconductive layer with a photovoltaic layer. Enables high chroma stability and increases the lifetime of electrophotographic image carrier components I'm letting you do it.

Applicability to industry This invention is a zero X-ray device used in copiers, medical and industrial non-destructive testing. Graphic machines, computer output recording devices, laser recording for direct production of printed circuits. Recording equipment, laser electrophotographic printing machines, phototypesetting machines, seismic oscillographs, welded seams Used in test equipment, electrophotography directly involving the manufacture of, and aerial photography. obtain.

Procedural amendment (formality) 1 Display of incident 2 Name of the invention electrophotographic image carrier 3 Person making the amendment Relationship to the incident Patent applicant Shipping date: May 14, 1991 6 Target of correction Translation of the description and claims.

7 Contents of amendment international search report ”’　PCT/StJB8100257

Claims (7)

[Claims] 1. a metal substrate (1), a photoconductive layer (4), and a metal substrate electrically coupled to the photoconductive layer. In an electrophotographic image carrier member comprising an intermediate electrically conductive stabilizing layer (3), a metal-based An elastic layer (2) is arranged between the body (1) and the conductive layer (3), said elastic layer (2) is applied to the metal substrate (1) and the material of the photoconductive layer (4) is brought into an amorphous state. A resistant material having a thermal stability temperature exceeding the temperature of the surface of the metal substrate (1) at the transition temperature. An electrophotographic image carrier member characterized in that it is formed from a thermal polymeric material. . 2. The elastic layer (2) made of a heat-resistant polymer material is electrically conductive. An electrophotographic image carrier member according to claim 1, characterized in that the electrophotographic image carrier member has the following characteristics: 3. An elastic layer (2) of a heat resistant polymeric material protects the electrophotographic image carrier member from exposure. It has the same width as the optical region (L) and between the conductive layer (3) and the metal substrate (1). The electrical connection is made to a portion of the electrophotographic image carrier member that is repositioned outside the exposure area (L). An electronic photograph according to claim 1, characterized in that the electronic photograph is taken directly against Image carrier member. 4. Claims 1 to 3, characterized in that the polymer material is polyurethane. An electrophotographic image carrier member according to any one of paragraphs. 5. Claims 1 to 3, characterized in that the polymer material is polyamide. An electrophotographic image carrier member according to any one of the above. 6. Claim No. 1, characterized in that the polymer material is a polymer arylate. Electrophotographic image carrier member according to any one of items 1 to 3. 7. Claims characterized in that the polymeric material is an ether of cellulose Electrophotographic image carrier member according to any one of items 1 to 3.