JP3669553B2 - Photosensitive drum substrate and method for manufacturing photosensitive drum substrate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drum substrate that is sensitive to electromagnetic waves such as light and that constitutes a photosensitive drum used in electrophotographic copying machines, printers, facsimiles, and the like, and a method for manufacturing the same.
[0002]
[Prior art]
In order to make an image formed by an image forming apparatus such as a copying machine using a photosensitive drum clear and uniform in density, the thickness of the photosensitive layer on the photosensitive drum is made of a conductive material such as aluminum. It is necessary to be uniform over the entire surface of the photosensitive drum. For this reason, the surface of a drum substrate such as aluminum, which becomes the photosensitive drum, is mirror-finished by turning with a diamond tool, etc., and then the cross-section curve measurement with a surface roughness meter and visual appearance inspection are performed to evaluate the flatness of the drum substrate Is going.
[0003]
[Problems to be solved by the invention]
However, the conventional drum base manufacturing with the above-described appearance inspection has the following problems. First, when the surface of a drum base is turned, it is difficult to obtain a uniform surface because of the influence of shape accuracy and homogeneity of a conductive material such as aluminum, vibration of a processing machine, accuracy of a processing jig, and the like. In other words, turning with a diamond tool or the like forms minute mirror surface irregularities on the surface of the substrate, but abnormal surface portions in which these irregularities are not regularly arranged alternately may be formed and defective products may flow out. .
[0004]
In order to eliminate the waste of the photosensitive layer being coated on the defective drum substrate, the surface roughness meter is used to measure the cross-section curve with a surface roughness meter. It is necessary to enlarge the vertical magnification to 5,000 times or more, and since the measurement magnification is high, a dedicated holding tool for holding the drum base is necessary, and there is a problem that the measurement time becomes long.
[0005]
In addition, this surface roughness meter can measure only a part of the entire drum base surface from the measurement magnification, and the surface roughness meter cannot detect all abnormal points on the surface, resulting in a defective product. There is also a problem that can be leaked.
[0006]
On the other hand, in the case of visual inspection, turning oil is required for turning aluminum used for the drum base, and the turning oil adheres to the mirror surface on the surface of the drum base after the turning process. There is a problem that it is difficult to detect an abnormal surface portion by visual observation, and there is a possibility that defective products may flow out.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to manufacture a photosensitive drum substrate that can easily inspect abnormalities on the surface of the photosensitive drum substrate, can easily prevent the outflow of defective products, and leads to a reduction in defective costs. The object is to provide a surface inspection method suitable for use .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the surface inspection method according to the present invention comprises polishing at least a part of a mirror surface formed by unevenness of a photosensitive drum substrate in a direction perpendicular to the turning direction to roughen only the convex part. It is characterized by observing whether or not the rough surface portion and the mirror surface portion are regularly arranged by making the surface, and inspecting the surface of the photoreceptor substrate for abnormality.
[0009]
A method of manufacturing a photosensitive drum base that achieves the above-described object is a method of manufacturing a photosensitive drum base by turning the outer peripheral surface of the base to form a mirror surface having irregularities, wherein at least a part of the mirror surface has a turning direction. In this case, only the convex portion is roughened by polishing in a direction perpendicular to the surface.
[0010]
The convex portion may be polished with a resin film having an abrasive fixed on the surface, and aluminum oxide may be used as the abrasive. The average particle size of the abrasive is preferably 11.5 μm to 14.5 μm.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a photosensitive drum substrate of this embodiment. First, the extruded and drawn aluminum alloy pipe, which is the material of the drum base 1, is turned with a diamond tool, and the outer peripheral surface is made uniform with high accuracy to form a drum base 1 having a mirror surface composed of minute irregularities. Then, the surface of the drum substrate 1 is brought into an inspectable state by a roughening process described below, and this is used as the drum substrate 1 before coating of the photosensitive layer.
[0012]
As the resin film 2 used for polishing for inspection, for example, an imperial wrapping film manufactured by Sumitomo 3M Co., Ltd. having a particle size of 12 μm can be used. The average particle size of the abrasive of the resin film 2 is preferably 11.5 μm to 14.5 μm as the photosensitive drum. This is because the surface is roughened to such an extent that an appearance inspection described later can be performed without affecting the function of the photosensitive drum.
[0013]
Note that the turning of the surface of the drum base 1 with a diamond tool is generally very fast at a turning speed of 10 m / sec. In this embodiment, turning is performed at 0.012 sec / rotation, and the abnormal portion on the surface makes two or three rounds of the substrate. Therefore, the disturbance of the surface waveform can be grasped by observing a part of the drum base 1 in the circumferential direction.
[0014]
As shown in FIG. 1, polishing for inspection is performed only once in the axial direction with respect to the mirror surface of the drum base 1 while holding the resin film 2 on the fingertip. Specifically, a resin film 2 having an abrasive bonded to the surface of the drum base 1 is pressed and deformed according to the curvature of the drum base 1 surface, and this is turned along the outer peripheral direction of the drum base 1. Move in the direction Y perpendicular to the direction (arrow direction X in the figure).
[0015]
By the movement of the resin film 2, the minute convex portions on the surface of the drum base 1 are roughened. The roughened surface changes from a mirror surface to a white surface. Reference numeral 3 in FIG. 1 indicates a mirror surface portion, and reference numeral 4 indicates a portion where a white portion appears. In addition, since the resin film 2 is used, no paper dust is generated and no foreign matter adheres to the drum base 1. However, if foreign matter of chips is attached, it may be removed by washing.
[0016]
FIG. 2 is an enlarged cross-sectional view in which the surface portion of the drum base 1 is cut in the axial direction. The portion that becomes white by polishing is only the portion 5a near the apex of the convex portion 5 on the surface of the drum base 1, and the inside of the concave portion 6 remains as a mirror surface without being roughened. Further, since the polishing agent for roughening the apex vicinity portion 5a is adhered and fixed to the resin film 2, the polishing agent does not enter the minute recess 6 during polishing, and the mirror surface of the recess 6 is whitened. Never happen.
[0017]
When the polished surface is observed in this state, a white surface portion of the convex portion 5 and a mirror surface portion of the concave portion 6 are regularly and alternately arranged on a normal surface, but on the abnormal surface, the white portion of the convex portion 5 is observed. It can be seen that the mirror surface portion of the recess 6 is irregularly arranged. Thus, an abnormal surface portion can be easily detected from the appearance by one polishing.
[0018]
Since the size of the portion 5a near the vertex to be roughened is very small compared to the size of the convex portion 5, the influence on the surface of the drum base 1 is slight. As shown in FIG. If the photosensitive layer 7 is coated on the surface, the photosensitive drum can be used sufficiently.
[0019]
【The invention's effect】
As described above, according to the present invention, since at least a part of the outer peripheral surface as a mirror surface is polished in a direction perpendicular to the turning direction, only the convex and concave portions of the mirror surface are roughened. The concave portions are not roughened and remain in a mirror surface. On a normal surface, convex portions (rough surface portions) and concave portions (mirror surface portions) are regularly and alternately arranged, and on an abnormal surface, convex portions (rough surface portions) and concave portions (mirror surfaces). Therefore, by observing the arrangement of the projections and the recesses, it is possible to easily find an abnormality on the surface of the drum base and prevent the outflow of defective products. Further, the defective cost can be reduced by preventing the coating of the photosensitive layer onto the defective drum substrate.
[0020]
According to the surface inspection method of the present invention, when particular polished by a resin film which abrasive is fixed to the convex portion on the surface, by deforming in response to a resin film to the curvature of the drum base, the drum base Part of the surface can be uniformly roughened, and since a resin film is used, paper dust is not generated , and adhesion of foreign matter to the drum base can be prevented, which is suitable for surface inspection.
[0021]
If the abrasive is aluminum oxide, there is no damage to the aluminum alloy of the drum base, and since it is aluminum oxide, it can be used as a photosensitive drum without any problem even if it remains on the base.
[0022]
Further, if the average particle size of the abrasive is 11.5 μm to 14.5 μm, it is possible to easily detect an abnormal portion on the surface of the drum base, and the drum base even if a part of the drum base is roughened. There is no damage on the surface, and it can be used as a photosensitive drum even after coating of the photosensitive layer.
[Brief description of the drawings]
FIG. 1 is a perspective view showing how a drum substrate is roughened.
FIG. 2 is an enlarged cross-sectional view of a drum base surface portion.
FIG. 3 is a cross-sectional view showing a state in which a photosensitive layer is coated on the surface of a drum base.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drum base | substrate 2 Resin-made film 3 Mirror surface 4 The mirror surface where a white part appears 5 Convex part 5a of a drum base | substrate surface The vertex vicinity part (roughening part)
6 Drum base surface recess 7 Photosensitive layer X Drum base turning direction Y Perpendicular to turning direction

Claims (3)

By polishing at least a part of the mirror surface consisting of irregularities formed by turning the photosensitive drum substrate in a direction perpendicular to the turning direction to roughen only the convex portion, the rough surface portion and the mirror surface portion are regularly arranged. A surface inspection method for observing whether or not the surface of the photoconductor substrate is abnormal and inspecting the surface of the photoreceptor substrate . The surface inspection method according to claim 1, wherein the surface of the photoreceptor substrate is inspected by polishing the mirror surface of the photoreceptor drum substrate with a resin film to which an abrasive is fixed . The surface inspection method according to claim 2, wherein the abrasive is aluminum oxide.

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