JPS5886585A - Drumlike image carrier member - Google Patents

Abstract

PURPOSE:To obtain a lightweight drum free of mechanical deformation by forming a drumlike image carrier of an endless belt manufactured by electroforming, specifying the thickness of a drum base body to 0.01-2mm., and providing an annular auxiliary part in the drum base body. CONSTITUTION:An endless belt of Al with a 0.01-2mm. thickness manufactured by electroforming is used to form a drumlike base body 1. The base body 1 and a supporting shaft 3 are set with a flange 2 and an annular auxiliary member 10. Then, an SeTe layer 5 is formed by vacuum deposition on the cylindrical base body 1 to obtain a drum like image carrier. The drum is prevented from deforming because of the annular reinforcing member 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a drum-shaped image carrier Ii material included in an electrostatic recording device of an electrophotographic copying machine section.

Seidenki - A drum-shaped device in which a photoconductive substance or dielectric substance is deposited or coated on the circumferential surface of a cylindrical drum *m
Using a holding member, an electrostatic latent is formed on a drum-shaped image carrier * (hereinafter simply referred to as an image carrier) and this is caused to occur;
The electrostatic film is developed into a toner image, and this toner image is transferred and fixed onto recording paper.

Conventionally, this image carrier has been used as a drum base by cutting an Aluminum casting or an Algi cylindrical tube, and depositing or coating a photoconductive substance or a dielectric substance on the circumferential surface of the drum base. In addition to aluminum, nickel, steel, brass, stainless steel, and other materials are used as the material for the base of the image carrier; however, the outer peripheral surface of the drum can be formed by turning using a diamond or other tool, or by puff polishing. , super finishing processing method.

Processed by liquid honing method etc. Even if the drum is manufactured by precision casting, machining of the outer peripheral surface cannot be omitted due to the mating surfaces of the wedges and the draft angle. Further, when cutting a long cylindrical pipe into #1, the above processing cannot be omitted.

For example, a photoconductive material may be applied to a drum substrate, either directly or through a dispersion of a subbing layer. , it is necessary that a specific drum surface condition be obtained.

Surface roughness must be maintained within a certain range over the entire circumference. The magnitude of this ms depends on the material of the drum base, the type of photoconductive material formed on the scissor drum base, or when an undercoat layer is formed between the scissor drum base and the photoconductive material. It varies slightly depending on the type, etc., but usually #O,! II to about 3.08. For example, when a selenium-based photosensitive material is formed on a drum base by vapor deposition, the surface roughness of the drum base is less than o,tst. The electrophotographic photoreceptor (II
If the carrier) is used repeatedly, there is an extremely high risk that the layer of the photoconductive material will peel off, and the surface roughness is 3. O
An electrophotographic photoreceptor constructed with a substrate larger than 8 may have a large dark attenuation of the surface potential given in the charging step of the electrophotographic process, or may cause irregularities in the formed image due to the influence of surface roughness. K becomes.

For this reason, conventionally, various types of processing have been performed to obtain a surface roughness that corresponds to the original conductive layer and undercoat layer. Here, the undercoat layer serves as a barrier to the movement of carriers such as electrons or holes between the conductive body (drum base) of the photoreceptor and the photoconductive material, and serves as a bond between the drum base and the photoconductive material. It is sometimes set up to strengthen the

In addition, conventionally, the thickness of the drum base of the image carrier must be increased in order to prevent deformation or to perform the various processing mentioned above.As a result, the weight 1 is increased and the inertia is large. The drawback was that it required a large amount of power and was inefficient.

In view of the above points, the inventor conducted various studies and determined that the wall thickness was 28 mm.
We successfully created the following cylindrical body with the desired surface roughness of the circumferential surface of the cylindrical body, and used it as the base of an image carrier. The base of the image carrier is prepared by supporting both ends of the cylindrical body (drum) with seven disc-shaped flange for maintaining the shape and maintaining the distance from the rotational support shaft, and a light beam is formed on the circumferential surface of the core cylindrical body. By applying a conductive material to form an image carrier and incorporating it into a Seidenki Kama device, an image carrier that is lighter than the conventional image carrier can be obtained, and as a result, it can be easily attached to and removed from the device.

Continuing with cost reductions due to savings in initial hot water, the inertia factor of the drum has become much smaller than in the past, and the power required to start and stop the rotation of the drum is now sufficient.

However, when used for a long period of time, the drum often becomes uneven, degrading the quality of the copies and causing mechanical failure.

The present invention was made for the purpose of providing a can with a low inertia factor, light weight, easy attachment and detachment of the device, and no mechanical deformation during use. This is achieved by forming a drum-shaped support member with a thickness of 0.01 to 2 cm, and providing a reinforcing member in addition to the end holding member inside the drum base.

Hereinafter, the present invention will be explained in detail using the drawings.

Stripes! The figure is a schematic cross-sectional view of an image carrier showing an embodiment of the LIT of the present invention, where t is the cylindrical base of the 11a support made by electroforming, and k is the end provided at both ends of the drum. In the holding part 1m (7 lunges), 3 is a support shaft for rotation, which is integrally fixed by a stopper 4. Reference numeral 10 denotes a reinforcing member newly provided according to the present invention, and in this embodiment, a ring-shaped reinforcing member is shown.

The ring-shaped reinforcing member 10 is made of aluminum and has an outer diameter of a perfect circle, and is made with high precision so as to substantially match the inner diameter of the cylindrical base body 1. In addition, the ring-shaped reinforcing member 1
The inner diameter of the support shaft 3 is also made to match the outer diameter of the support shaft 3 with high accuracy. The ring-shaped reinforcing member 10 is connected to the cylindrical base 1
It is fixed to the cylindrical base 1 and the support shaft 3 using an adhesive such as epoxy adhesive near the center of the cylindrical base 1 and the support shaft 3.

As is already well known, electroforming is a method of making a predetermined shape by using metal electrodeposition similar to plating, and it is possible to make a seamless long thin cylindrical body. In this example, an aluminum thin-walled cylinder with an outer diameter of 120 mm, a wall thickness of 0.25 w, and a length of 320 m was used. With the electroforming method, many materials can be selected at will, including nickel, chromium, zinc, copper, brass, and stainless steel, in addition to gamma metal. Further, the circular surface can be made to have any smoothness by controlling the surface properties of the electrodes (cylindrical) to be electrodeposited and the amount of current used for electrodeposition. Although it depends on the material, it is effective for cyanide WI-, and the surface roughness is about 0.18 by controlling the current density such as P-11, which changes the direction of DC periodically, connecting DC current, and superimposing DC current. It can be obtained by controlling up to As mentioned above, it is desirable that the surface of the substrate for the photoreceptor is within the range of 0.3 to 3S, and in this embodiment, IS is used without machining the surface.

In this example, a support layer was immediately formed on the circumferential surface of the thin cylindrical substrate 10 to give it an appropriate level of smoothness without carrying out the surface polishing process described above.

Examples of the support layer provided on the cylindrical substrate 1 include a photosensitive layer deposited with selenium or an alloy of selenium, tellurium, and arsenic, zinc oxide, zinc sulfide, a sulfide-based film, and a sulfide-based dielectric film. photosensitive layer in which inorganic photoconductive substances such as lead oxide, titanium oxide, and mercury sulfide are dispersed in resin; organic photoconductive substances such as polyvinylcarbazole, anthracene, polycyclic quinone dyes, pyrylium dyes, bisazo dyes, and turocyanine pigments; The main part of the photo-sensitization process using . Methods for forming these original conductive layers include not only the method of vapor deposition of selenium, but also the method of dissolving a photoconductive substance and a binder resin layer added as necessary in these solvents, and applying the resulting composition to a cylindrical substrate. It is provided by applying a coating on the surface. As mentioned above, an undercoat layer may be formed on the cylindrical substrate for the purpose of improving the adhesion of the photoconductive substance and providing an electrical barrier, and the photoconductive substance may be provided thereon.

A dielectric layer is also used as a support layer that is not a photoconductive material. In electronic recording devices using a multi-stylus method, ion flow modulation, etc., a dielectric layer is applied to form a static recording device with low attenuation.

In this example, a selenium tellurium layer 5 having a thickness of ωμ was formed by vacuum evaporation on the circumferential surface of an aluminum cylindrical substrate produced by the above-mentioned electroforming method.

A commercially available copying machine (Konishi Roku Photo Industry IIU-Hiki XV2) K was equipped with the carrier provided with the ring-shaped reinforcing member 10 described above, and copies were made 50,000 times in a row, but the images were all clear. was gotten. On the other hand, photosensitive drums without ring-shaped reinforcement #10 have a high probability of developing local unevenness or twisting during a 50,000-time continuous copying test, leading to deterioration in the quality of copied images or damage to the machine. This often caused mechanical failures.

Although only one ring-shaped reinforcing member 10 is used in this embodiment, it is of course not limited to 1IllIK, and the material may be reinforced resin or the like. Furthermore, the ring-shaped reinforcing member 10 can be fixed by a method called "Yakipame" which utilizes thermal expansion without using an adhesive.

FIG. 2 shows a part of the embodiment of 11112,
Front view of the attached reinforcing member (Figure 2 (a)) and A-0
- Cross-sectional view on A2 side #! Figure 2(b) shows K.

Two opposing pressure discs 12 m, 1 as reinforcing members
2 b, with four suppressing members 11 in between, and four tightening screws 13 and tightening nuts 14 to tighten the pressing disk 12m,
When tightened so as to be close to each other in parallel, the four suppressing members 11 are pushed in the circumferential direction, reinforcing and fixing the cylindrical base 1 in a perfect circular shape.

The M2 embodiment was also tested by being attached to a copying machine in the same manner as the first embodiment, and it was found that there was a clear difference in effectiveness between when the reinforcement component diagnosis was provided and when it was not provided. did it.

[Brief explanation of the drawing]

1114 is a schematic sectional view of the first embodiment of the present invention,
FIG. 1112 schematically shows a front view (FIG. 2(a)) and a cross-sectional view (FIG. 1112(b)) of the second embodiment. l...Cylindrical base (drum base) 2...
End holding member (7 langes) 3...Support shaft 10...Ring-shaped reinforcing member agent Yoshimi Kuwahara

Claims (3)

[Claims] (1) Drum base 0.0! When formed with a thickness of ~2u, the drum-shaped G1 god-bearing body member is provided with a reinforcing member in addition to the end holding member inside the drum base. (2) The drum-shaped self-supporting body member according to claim 1, wherein an endless belt produced by electroforming is used as the drum base. (3) The drum-shaped image carrier member according to claim 1 or 2, wherein the ring-shaped member is a ring-shaped member.