JP2643851B2 - Method of forming ground circuit of photosensitive drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a grounding circuit for a photosensitive drum, and more particularly to a method for forming a grounding circuit for a cylindrical photosensitive drum used in an electrophotographic apparatus such as a copying machine, a printer or a facsimile. It is about the method.

[0002]

2. Description of the Related Art Conventionally, this type of electrophotographic photoreceptor has a cylindrical base and flanges mounted on both ends thereof. The cylindrical substrate and the flange portion are both formed of a conductive member, and at the same time, serve as a barrier for improving the adhesion between the cylindrical substrate and the photosensitive layer and preventing charge transfer. An insulating film is provided in a layer form. An anodic oxide film is often used as this insulating film, but the anodic oxide film is formed by immersing the entire member in an electrolytic solution and anodic oxidizing it. Is done.

[0003] As a method of grounding the flange portion provided with such an insulating film, a ground electrode such as a metal plate is inserted into the insulating layer on the end portion or the back side of the support having no photosensitive layer by mechanical pressure. Destroy the insulating layer and contact it with the conductive support under the insulating layer, peel off the insulating layer with a file, etc., or mask the grounding part on the support before forming the insulating layer. There is a method in which an insulating layer is not formed and an earth electrode is brought into contact with the insulating layer.

[0004]

However, the method of bringing an electrode such as a metal plate into contact with the electrode requires a considerable mechanical strength of the electrode, and is limited in shape and material.
Further, the thickness of the conductive support is reduced in order to reduce the weight and cost, and the conductive support that is brought into contact with the conductive support is deformed due to its mechanical strength, thereby impairing the dimensional accuracy. In addition, the peeling of the insulating layer and the use of a mask at the time of forming the insulating layer complicate the manufacturing conditions, resulting in an increase in cost.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to improve the disadvantages of the prior art, especially to impair the quality of a cylindrical photosensitive member having a small mechanical strength or a cylindrical photosensitive member having strict dimensional accuracy. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for forming a ground circuit on a photosensitive drum that can form a ground circuit quickly, reliably and without any problems.

[0006]

Means for Solving the Problems To achieve the above object,
Therefore , according to the present invention, a cylindrical photoreceptor made of a conductive member in which the entire inner and outer surfaces are insulated and provided with an insulating film and a photoreceptor film is provided on the outer surface, and fitted on the inner diameter of one end of the cylindrical photoreceptor Between the rotation center shaft of the flange and the predetermined position on the inner surface of the cylindrical photoreceptor. Then, a predetermined dielectric breakdown voltage is applied to set a conduction state between the two . At the same time, the aforementioned breakdown voltage
Hand upon the application of, in advance, the inner surface of the electrodes of the cylindrical photosensitive member
It is configured to be mounted on the pedestal for fixing the cylindrical photoreceptor .

[0007]

[Work] For a photosensitive member to which a high voltage is applied, for example, a thickness of 0.
Conduction was also achieved with a 10 mm metal plate, but the photoreceptor to which no high voltage was applied had poor conduction with a metal plate having a thickness of 0.15 mm or less. In addition, it was confirmed that a metal plate having a thickness of 0.30 [mm] (disc-shaped metal plate) caused deformation of the raw material tube even when a high voltage was applied. For this reason, in the range of the said Example, it turned out that a thin thing (namely, a thing with small mechanical strength) is favorable about a disk-shaped metal plate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a cylindrical photosensitive member, and reference numeral 2 denotes a flange. The cylindrical photoreceptor 1 is formed of a conductive member in which the entire inner and outer surfaces are insulated and provided with an insulating film, and the outer surface is provided with a photosensitive film. Further, the flange portion 2 is formed of a conductive member which is fitted to the inner diameter portion of one end of the cylindrical photoreceptor 1 and is also provided with an insulating film on the entire surface.

Then, a predetermined dielectric breakdown voltage is applied between the rotation center shaft portion of the flange portion 2 and a predetermined position on the inner surface side of the cylindrical photoreceptor 1, thereby causing a dielectric breakdown between the two. The two are set to a conductive state.

Further, in the present embodiment, when a dielectric breakdown voltage is applied, the electrode on the inner surface side of the cylindrical photoconductor 1 is provided on the pedestal 11 for fixing the cylindrical photoconductor in advance.

Further, the flange portion 2 is provided with a disk-shaped metal plate 2A having conductive legs 2a abutting on the inner surface of the cylindrical photoreceptor 1 at four equally-spaced locations (the legs). The number of 2a may be one or two, and the number is not particularly limited.)

Hereinafter, this will be described in more detail.

The above-described cylindrical photoreceptor 1 is formed of an aluminum tube having a diameter of 30 [mm] and a thickness of 0.75 [mm] whose inner and outer surfaces are anodized, and a photosensitive layer is provided on the outer periphery. I have. A flange 2 to which a disc-shaped metal plate 2A having a thickness of 0.10 [mm] as shown in FIG. The disk-shaped metal plate 2A is made of PBSP-H, and the leg pieces 2a protrude radially around the periphery thereof at 90-degree intervals as described above. The tip of the leg piece 2a is sharp, and the length of contact with the inner surface of the aluminum tube is set to 0.20 [mm].

[0015] The other end portion of the cylindrical photosensitive member 1 is engaged with the base 11 from the inside of the cylindrical photosensitive member 1 of contact with the electrode line 12A as shown in FIG. Reference numeral 12 denotes an electrode wire 12
A shows an electrode which is conducted to A and mounted on the pedestal 11. Then, a high voltage is applied between the electrode 12 and the electrode 21 which is electrically connected to the disk-shaped metal plate 2A and is provided on the central axis of the flange portion 2. The photoconductor drum thus obtained is referred to as photoconductor A here.

Next, in order to compare and examine the conduction state between the cylindrical photosensitive member 1 and the flange portion 2 of the photosensitive member A obtained by the above method, members having different thicknesses of the metal plate 2A are described.
(As shown in FIG. 3, the thickness is 0.15 [mm], 0.20 [m
m] and 0.30 [mm]), an attempt was made to form a ground circuit by the same method. In this case, the photoconductors are denoted by B, C, and D. Further, as comparative examples, photoconductors E, F, G, and H were prepared similarly, and were prepared without applying a high voltage. FIG. 3 shows a list of these samples. Then, with respect to these samples, a continuity test and an inspection of the deformed state of the cylindrical photoconductor 1 were tried again. The result is shown in FIG .

Thus, the photosensitive members A to D to which a high voltage is applied
Became conductive even with a 0.10 mm thick metal plate,
The photoreceptor to which no high voltage was applied had poor conduction with a metal plate having a thickness of 0.15 [mm] or less. In addition, it was confirmed that the aluminum tube was deformed in the case of the metal plate having a thickness of 0.30 [mm] (the disk-shaped metal plate 2A of the photoconductor D), even when a high voltage was applied.

For this reason, it has been found that it is more convenient for the disk-shaped metal plate 2A to be thinner in the range of the above embodiment.

[0019]

Since the present invention is constructed and functions as described above, according to this, a high voltage is applied between the cylindrical photoreceptor covered with the insulating film and the cylindrical photoreceptor covered with the insulating film. The method of causing dielectric breakdown by applying voltage makes it possible to use electrodes that do not require particularly high mechanical strength. It is possible to provide an unprecedented excellent method for forming a ground circuit of a photosensitive drum, which can reliably form a ground circuit without causing a substantial deformation.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a view showing an example of a flange portion incorporated in FIG. 1, wherein FIG. 2 (A) is a front view thereof , and FIG. 2 (B) is FIG. 2 (A).
It is a right side view of.

FIG. 3 is a table showing an example of a comparative sample of a comparative experiment performed in practicing the present invention.

FIG. 4 is a table showing the results of conducting a continuity test on each sample of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical photoreceptor 2 Flange part 2A Disk-shaped metal plate 2a Conduction leg 11 Base for fixing cylindrical photoreceptor 12A Electrode wire 12, 21 Electrode

Claims (2)

(57) [Claims] 1. A cylindrical photoreceptor made of a conductive member having an inner and outer entire surface insulated and provided with an insulating film and a photoreceptor film on an outer surface, and fitted to an inner diameter of one end of the cylindrical photoreceptor. And a flange portion made of a conductive member also provided with an insulating film on the entire surface thereof, wherein a rotation center shaft portion of the flange portion and a predetermined position on the inner surface side of the cylindrical photoreceptor. sets a therebetween in a conductive state by applying a predetermined breakdown voltage, upon application of the breakdown voltage, the inner surface of the cylindrical photosensitive member
Electrode on the pedestal for fixing the cylindrical photoreceptor in advance.
A method for forming a ground circuit on a photosensitive drum, comprising: 2. The entire inner and outer surfaces are insulated and coated with an insulating film.
Cylinder made of conductive material with a photosensitive film on the outer surface
And an optical member, which is fitted to the inner diameter of one end of the cylindrical photoreceptor.
Flanges made of conductive material with an insulating coating all over
A photosensitive drum provided with a flange portion, and a rotation center shaft portion of the flange portion and the cylindrical photosensitive member.
Apply a predetermined dielectric breakdown voltage between the
And the flange portion abuts on the inner surface of the cylindrical photoreceptor around.
And the thickness of the disk-shaped metal plate is
Set to 0.10 [mm], 0.15 [mm] or 0.20 [mm]
Characterized in that it is pre-equipped with a disc-shaped metal plate
Of forming a ground circuit of a photosensitive drum.